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@@ -129,7 +129,7 @@       -4x +1x       @@ -144,7 +144,7 @@       -53x +        @@ -190,7 +190,7 @@ export interface Identity extends HKT { // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion export const never = undefined as never;   -export type Constraint<T, U extends T> = U; +export type MaxDepth = 20;   export class AssertionError extends Error { public constructor(msg?: string) { @@ -199,11 +199,11 @@ export class AssertionError extends Error { } }   -export function assert( +export function assert( condition: unknown, msg?: string, ): asserts condition { - Iif (!Boolean(condition)) + if (!Boolean(condition)) throw new AssertionError( ["Assertion error", msg] .filter((v) => v !== undefined) @@ -247,7 +247,7 @@ export interface HidePrototype {
Code coverage generated by istanbul - at 2026-06-23T20:42:03.618Z + at 2026-06-26T02:19:51.712Z
+ + + + + + \ No newline at end of file diff --git a/coverage/src/mixin/math/index.html b/coverage/src/mixin/math/index.html new file mode 100644 index 0000000..fa20cac --- /dev/null +++ b/coverage/src/mixin/math/index.html @@ -0,0 +1,116 @@ + + + + + + Code coverage report for src/mixin/math + + + + + + + + + +
+
+

All files src/mixin/math

+
+ +
+ 86.11% + Statements + 31/36 +
+ + +
+ 100% + Branches + 10/10 +
+ + +
+ 54.54% + Functions + 6/11 +
+ + +
+ 84.37% + Lines + 27/32 +
+ + +
+

+ Press n or j to go to the next uncovered block, b, p or k for the previous block. +

+ +
+
+
+
src -
+ 		+
33.33%2/650%1/250%2/433.33%2/644.44%4/90%0/225%1/444.44%4/9
src/mixin -
+ 		src/mixin +
92.79%103/11196.29%26/2786.27%44/5193.2%96/10342.26%82/19436.11%13/3610.11%9/8950.31%80/159
src/mixin/math +
+ 		86.11%31/36100%10/1054.54%6/1184.37%27/32
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FileStatementsBranchesFunctionsLines
swizzle.ts +
+ 		86.11%31/36100%10/1054.54%6/1184.37%27/32
+
+
+ +
+ Code coverage generated by + istanbul + at 2026-06-26T02:19:51.712Z +
+ + + + + + + \ No newline at end of file diff --git a/coverage/src/mixin/math/swizzle.ts.html b/coverage/src/mixin/math/swizzle.ts.html new file mode 100644 index 0000000..382dd01 --- /dev/null +++ b/coverage/src/mixin/math/swizzle.ts.html @@ -0,0 +1,901 @@ + + + + + + Code coverage report for src/mixin/math/swizzle.ts + + + + + + + + + +
+
+

All files / src/mixin/math swizzle.ts

+
+ +
+ 86.11% + Statements + 31/36 +
+ + +
+ 100% + Branches + 10/10 +
+ + +
+ 54.54% + Functions + 6/11 +
+ + +
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+ + +
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+ 
import { makeFluent } from "../../base";
+import type { Props, Return } from "../../base/mixin";
+import { type MaxDepth } from "../../internal";
+import { Math } from "../math";
+ 
+type Axis = typeof axis;
+type Vec<
+	T,
+	N extends number,
+	TOut extends T[] = [],
+> = TOut["length"] extends N
+	? TOut
+	: TOut["length"] extends MaxDepth
+		? T[]
+		: Vec<T, N, [...TOut, T]>;
+ 
+type Inc<N extends number | undefined> = N extends number
+	? [...Vec<null, N>, null]["length"]
+	: 0;
+type Dec<N extends number> =
+	Vec<null, N> extends [...infer Rest extends null[], null]
+		? Rest["length"]
+		: -1;
+ 
+type Next<
+	N extends number,
+	State extends readonly (number | undefined)[],
+	TOut extends (number | undefined)[] = [],
+> = State extends readonly [
+	infer Current extends number | undefined,
+	...infer Rest extends (number | undefined)[],
+]
+	? Inc<Current> extends infer TInc
+		? TInc extends N
+			? Next<N, Rest, [...TOut, undefined]>
+			: [...TOut, TInc, ...Rest]
+		: never
+	: null;
+ 
+type Key<
+	State extends (number | undefined)[],
+	TOut extends string = "",
+> = State extends readonly [infer Only extends number, ...undefined[]]
+	? `${TOut}${Axis[Only]}`
+	: State extends readonly [
+				infer Current extends number,
+				...infer Rest extends (number | undefined)[],
+		  ]
+		? Key<Rest, `${TOut}${Axis[Current]}`>
+		: never;
+ 
+type IsAscending<
+	State extends (number | undefined)[],
+	Prev extends number | undefined = undefined,
+> = State extends readonly [
+	infer Current extends number,
+	...infer Rest extends number[],
+]
+	? Current extends Inc<Prev>
+		? IsAscending<Rest, Inc<Prev>>
+		: false
+	: State extends readonly []
+		? true
+		: false;
+ 
+type Pretty<T> = { [K in keyof T]: T[K] };
+ 
+type SwizzlePermutations<
+	N extends number,
+	State extends Vec<number | undefined, N> = Vec<undefined, N>,
+	TOut extends Record<string, readonly number[]> = Record<
+		never,
+		never
+	>,
+> =
+	Next<N, State> extends infer TNext
+		? TNext extends Vec<number | undefined, N>
+			? SwizzlePermutations<
+					N,
+					TNext,
+					TOut &
+						(IsAscending<State> extends true
+							? unknown
+							: Record<Key<State>, State>)
+				>
+			: Pretty<TOut & Record<Key<State>, State>>
+		: never;
+ 
+type Sequence<
+	T extends readonly unknown[],
+	Indexes extends (number | undefined)[],
+	TOut extends T[number][] = [],
+> = Indexes extends readonly [
+	infer Current extends number,
+	...infer Rest extends (number | undefined)[],
+]
+	? Sequence<T, Rest, [...TOut, T[Current]]>
+	: TOut;
+ 
+type Primative<
+	T extends readonly unknown[],
+	t extends Props,
+	Axes extends readonly string[] = Axis,
+	Acc = unknown,
+	TOut extends unknown[] = [],
+> = Axes extends readonly [
+	infer Current extends string,
+	...infer Rest extends string[],
+]
+	? Acc &
+			Record<
+				Current,
+				Return<T[TOut["length"]], t>
+			> extends infer TAcc
+		? Primative<T, t, Rest, TAcc, [...TOut, TAcc]>
+		: never
+	: TOut;
+ 
+type SwizzleCache = [
+	{ x: [0] },
+	SwizzlePermutations<2>,
+	SwizzlePermutations<3>,
+	SwizzlePermutations<4>,
+];
+ 
+export type Swizzle<
+	T extends readonly unknown[],
+	t extends Props,
+> = number extends T["length"]
+	? unknown
+	: (
+				Dec<T["length"]> extends infer K extends 0 | 1 | 2 | 3
+					? { k: K; c: SwizzleCache[K] }
+					: SwizzleCache extends [...unknown[], infer Last]
+						? { k: Dec<SwizzleCache["length"]>; c: Last }
+						: never
+		  ) extends {
+				k: infer K extends number;
+				c: infer C extends Record<
+					PropertyKey,
+					(number | undefined)[]
+				>;
+		  }
+		? Omit<
+				{
+					readonly [K in keyof C]: Return<
+						Sequence<T, C[K]>,
+						t
+					>;
+				},
+				Axis[number]
+			> &
+				Primative<T, t>[K]
+		: never;
+ 
+const axis = ["x", "y", "z", "w"] as const;
+ 
+export function applySwizzle(
+	value: number[],
+	$: object,
+	fluent: (value: unknown) => never,
+) {
+	const length = value.length;
+	const state = new Array<number>(length).fill(-1);
+ 
+	main: do {
+		for (let i = 0; i < state.length; i++) {
+			state[i] += 1;
+			if (state[i] >= length) state[i] = -1;
+			else break;
+		}
+ 
+		let reachedEmpty = false;
+		for (const item of state) {
+			if (item === -1) {
+				reachedEmpty = true;
+			} else if (reachedEmpty) {
+				continue main;
+			}
+		}
+ 
+		const key = state
+			.filter((x) => x !== -1)
+			.map((x) => axis[x])
+			.join("");
+		if (key.length <= 1 || key in $) continue;
+		const permutation = state
+			.filter((x) => x !== -1)
+			.map((x) => value[x]);
+		Object.defineProperty($, key, {
+			get: () => {
+				// OPTIMIZE? Reduce amount of arrays allocated and held for the lambda..?
+				return fluent(permutation);
+			},
+		});
+	} while (state.some((x) => x !== -1));
+ 
+	Object.defineProperty($, "x", {
+		get: () => {
+			return fluent(value[0]);
+		},
+	});
+	Object.defineProperty($, "y", {
+		get: () => {
+			return fluent(value[1]);
+		},
+	});
+	Object.defineProperty($, "z", {
+		get: () => {
+			return fluent(value[2]);
+		},
+	});
+	Object.defineProperty($, "w", {
+		get: () => {
+			return fluent(value[3]);
+		},
+	});
+}
+ 
+if (import.meta.vitest) {
+	const { test, expect } = import.meta.vitest;
+ 
+	const registry = [Math] as const;
+	const $ = makeFluent(registry);
+ 
+	test("Swizzling (.xx, .xy, etc.)", () => {
+		const x = 5 as const;
+		const y = 7 as const;
+ 
+		const vec = [x, y] as const;
+ 
+		expect($(vec).xx.value).toMatchObject([x, x]);
+		expect($(vec).yx.value).toMatchObject([y, x]);
+		expect($(vec).yy.value).toMatchObject([y, y]);
+ 
+		const large = [x, y, x, y] as const;
+ 
+		expect($(large).wzyx.value).toMatchObject([y, x, y, x]);
+		expect($(large).xzyw.value).toMatchObject([x, x, y, y]);
+		expect($(large).ywxz.value).toMatchObject([y, y, x, x]);
+		expect($(large).xxxx.value).toMatchObject([x, x, x, x]);
+		expect($(large).wwww.value).toMatchObject([y, y, y, y]);
+	});
+ 
+	test(".x", () => {
+		const x = 5 as const;
+		const arr = [x] as const;
+ 
+		expect($(arr).x.value).toBe(x);
+	});
+ 
+	test(".y", () => {
+		const y = 2 as const;
+		const arr = [y, y] as const;
+ 
+		expect($(arr).y.value).toBe(y);
+	});
+ 
+	test(".z", () => {
+		const z = 9 as const;
+		const arr = [z, z, z] as const;
+ 
+		expect($(arr).z.value).toBe(z);
+	});
+ 
+	test(".w", () => {
+		const w = 0 as const;
+		const arr = [w, w, w, w] as const;
+ 
+		expect($(arr).w.value).toBe(w);
+	});
+}
+ 
+ +
+
+
+ Code coverage generated by + istanbul + at 2026-06-26T02:19:51.712Z +
+ + + + + + + \ No newline at end of file diff --git a/coverage/src/mixin/optional.ts.html b/coverage/src/mixin/optional.ts.html index 39070bc..19e9d66 100644 --- a/coverage/src/mixin/optional.ts.html +++ b/coverage/src/mixin/optional.ts.html @@ -23,30 +23,30 @@
- 87.09% + 35.48% Statements - 27/31 + 11/31
- 100% + 42.85% Branches - 7/7 + 3/7
- 69.23% + 15.38% Functions - 9/13 + 2/13
- 86.66% + 36.66% Lines - 26/30 + 11/30
@@ -61,7 +61,7 @@
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+ 

 
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+ 
  
import { makeFluent } from "../base";
 import type { HKT } from "../base/hkt";
 import {
@@ -680,7 +694,7 @@ export interface Optional extends Mixin.HKT {
 					 * expect(b).toBe(10);
 					 * @from {@link Optional `Optional`}
 					 */
-					or: (<U>(
+					or: (<const U>(
 						fallback: U,
 					) => Return<Some<T> | U, typeof t>) & {
 						/**
@@ -689,11 +703,13 @@ export interface Optional extends Mixin.HKT {
 						 * only computes the fallback if the value is `null` or
 						 * `undefined`
 						 * @param callback
+						 * @from {@link Optional `Optional`}
 						 * @example
+						 * ```ts
 						 * const none = () => null as number | null;
 						 * const some = () => 8 as number | null;
 						 *
-						 * const fallback = () => 22; // mocked
+						 * const fallback = vi.fn(() => 22); // mocked
 						 *
 						 * const a = $(none()).or.else(fallback).value;
 						 * expect(a).toBe(22);
@@ -702,7 +718,7 @@ export interface Optional extends Mixin.HKT {
 						 * expect(b).toBe(8);
 						 *
 						 * expect(fallback).toHaveBeenCalledOnce()
-						 * @from {@link Optional `Optional`}
+						 * ```
 						 */
 						else: <U>(
 							callback: (v: None<T>) => U,
@@ -711,7 +727,10 @@ export interface Optional extends Mixin.HKT {
 					/**
 					 * Assert that value is not `null` or `undefined`
 					 * @param msg Reasoning to attach to the `AssertionError`
+					 * @see `.assert.none()` for the inverse assertion
+					 * @from {@link Optional `Optional`}
 					 * @example
+					 * ```ts
 					 * const array = [1, 2, 3];
 					 * const element: number | undefined = array[1];
 					 *
@@ -721,8 +740,7 @@ export interface Optional extends Mixin.HKT {
 					 * expect(() => {
 					 *  $(array[6]).assert()
 					 * }).toThrow()
-					 * @see `.assert.none()` for the inverse assertion
-					 * @from {@link Optional `Optional`}
+					 * ```
 					 */
 					assert: ((
 						msg?: string,
@@ -730,7 +748,9 @@ export interface Optional extends Mixin.HKT {
 						/**
 						 * Assert that the value is either `null` or `undefined`
 						 * @param msg Reasoning to attach to the `AssertionError`
+						 * @from {@link Optional `Optional`}
 						 * @example
+						 * ```ts
 						 * const array = [1, 2, 3];
 						 * const element: number | undefined = array[5];
 						 *
@@ -740,6 +760,7 @@ export interface Optional extends Mixin.HKT {
 						 * expect(() => {
 						 *  $(array[1]).assert.none()
 						 * }).toThrow()
+						 * ```
 						 */
 						none: (
 							msg?: string,
@@ -750,18 +771,43 @@ export interface Optional extends Mixin.HKT {
 }
  
 export const Optional = Mixin<Optional>((value, $, fluent) => {
-	if (isNone(value)) {
-		$.and = () => {
-			return fluent(value);
+	Iif (isNone(value)) {
+		$.and = () => {
+			return fluent(value);
 		};
  
-		$.or = (fallback: unknown) => {
-			return fluent(fallback);
+		$.or = (fallback: unknown) => {
+			return fluent(fallback);
 		};
+		assertType<object>($.or);
+		Object.assign($.or, {
+			else: (callback: (v: unknown) => unknown) => {
+				return fluent(callback(value));
+			},
+		});
+ 
+		$.assert = (msg?: string) => {
+			assert(false, msg);
+		};
+		assertType<object>($.assert);
+		Object.assign($.assert, {
+			none: () => {
+				return fluent(value);
+			},
+		});
+	} else {
+		$.and = (callback: (v: unknown) => unknown) => {
+			return fluent(callback(value));
+		};
+ 
+		$.or = () => {
+			return fluent(value);
+		};
+ 
 		assertType<object>($.or);
 		Object.assign($.or, {
-			else: (callback: (v: unknown) => unknown) => {
-				return fluent(callback(value));
+			else: () => {
+				return fluent(value);
 			},
 		});
  
@@ -774,39 +820,14 @@ export const Optional = Mixin<Optional>((value, $, fluent) => {
 				assert(false, msg);
 			},
 		});
-	} else {
-		$.and = (callback: (v: unknown) => unknown) => {
-			return fluent(callback(value));
-		};
- 
-		$.or = () => {
-			return fluent(value);
-		};
- 
-		assertType<object>($.or);
-		Object.assign($.or, {
-			else: () => {
-				return fluent(value);
-			},
-		});
- 
-		$.assert = (msg?: string) => {
-			assert(false, msg);
-		};
-		assertType<object>($.assert);
-		Object.assign($.assert, {
-			none: (msg?: string) => {
-				return fluent(value);
-			},
-		});
 	}
  
-	$.where = (
+	$.where = (
 		callback: (v: unknown) => boolean,
-		fallback = null,
+		fallback = null,
 	) => {
-		if (callback(value)) return fluent(value);
-		return fluent(fallback);
+		if (callback(value)) return fluent(value);
+		return fluent(fallback);
 	};
 });
  
@@ -865,7 +886,7 @@ if (import.meta.vitest) {
             

                 Code coverage generated by
                 istanbul
-                at 2026-06-23T20:42:03.618Z
+                at 2026-06-26T02:19:51.712Z
             

         
         
+        
+        
+        
+    
+
+    
\ No newline at end of file
diff --git a/eslint.config.ts b/eslint.config.ts
index 145668f..e6c61b1 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -3,7 +3,7 @@ import tseslint from "typescript-eslint";
 import { defineConfig, globalIgnores } from "eslint/config";
 
 export default defineConfig([
-	globalIgnores(["dist"]),
+	globalIgnores(["dist", "tests/generated"]),
 	{
 		files: ["**/*.{ts,tsx}"],
 		extends: [
diff --git a/package.json b/package.json
index 9cce1fa..4dcf4cf 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
 	"version": "0.0.0",
 	"type": "module",
 	"scripts": {
-		"test": "vitest --run --reporter=tree --coverage",
+		"test": "gen-jet src/ --test-file-extension .doc.test --header 'import { test, expect, vi } from \"vitest\"; import { $ } from \"../../src\"' && mkdir -p ./tests/generated && mv ./src/**/*.doc.test.ts tests/generated && vitest --run --reporter=tree --coverage",
 		"build": "tsc -b && esbuild --minify --bundle src/index.ts --outdir=dist --define:import.meta.vitest=undefined",
 		"fmt": "prettier --write .",
 		"lint": "eslint .",
@@ -17,6 +17,7 @@
 		"@vitest/coverage-v8": "4.1.9",
 		"esbuild": "^0.28.1",
 		"eslint": "^10.3.0",
+		"generate-jsdoc-example-tests": "^0.2.6",
 		"jiti": "^2.7.0",
 		"madge": "^8.0.0",
 		"prettier": "^3.8.4",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c710453..c6c81cd 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -26,6 +26,9 @@ importers:
       eslint:
         specifier: ^10.3.0
         version: 10.5.0(jiti@2.7.0)
+      generate-jsdoc-example-tests:
+        specifier: ^0.2.6
+        version: 0.2.6
       jiti:
         specifier: ^2.7.0
         version: 2.7.0
@@ -310,6 +313,9 @@ packages:
   '@jridgewell/trace-mapping@0.3.31':
     resolution: {integrity: sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==}
 
+  '@microsoft/tsdoc@0.15.1':
+    resolution: {integrity: sha512-4aErSrCR/On/e5G2hDP0wjooqDdauzEbIq8hIkIe5pXV0rtWJZvdCEKL0ykZxex+IxIwBp0eGeV48hQN07dXtw==}
+
   '@napi-rs/wasm-runtime@1.1.5':
     resolution: {integrity: sha512-AWPoBRJ9tsnVhor4sjO7rkni+7p+2IAEFj6cx06UgP10jkQHqay/36uRV/bFkgrh18D9vb4cr8Q0Pthskgzy+Q==}
     peerDependencies:
@@ -618,6 +624,10 @@ packages:
   buffer@5.7.1:
     resolution: {integrity: sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==}
 
+  cac@6.7.14:
+    resolution: {integrity: sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==}
+    engines: {node: '>=8'}
+
   chai@6.2.2:
     resolution: {integrity: sha512-NUPRluOfOiTKBKvWPtSD4PhFvWCqOi0BGStNWs57X9js7XGTprSmFoz5F0tWhR4WPjNeR9jXqdC7/UpSJTnlRg==}
     engines: {node: '>=18'}
@@ -866,6 +876,10 @@ packages:
   function-bind@1.1.2:
     resolution: {integrity: sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA==}
 
+  generate-jsdoc-example-tests@0.2.6:
+    resolution: {integrity: sha512-4eHWFJ1TbBEEmDVe07Kt5Sgr0f6sZXSU44dpSulpOlQXZ+ddsuFAs9pEw22xPEJDFGSVJQlnUDoHuVihE9tHBQ==}
+    hasBin: true
+
   get-amd-module-type@6.0.2:
     resolution: {integrity: sha512-7zShVYAYtMnj9S65CfN+hvpBCByfuB1OY8xID01nZEzXTZbx4YyysAfi+nMl95JSR6odt4q8TCj2W63KAoyVLQ==}
     engines: {node: '>=18'}
@@ -1677,6 +1691,8 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  '@microsoft/tsdoc@0.15.1': {}
+
   '@napi-rs/wasm-runtime@1.1.5(@emnapi/core@1.10.0)(@emnapi/runtime@1.10.0)':
     dependencies:
       '@emnapi/core': 1.10.0
@@ -2034,6 +2050,8 @@ snapshots:
       base64-js: 1.5.1
       ieee754: 1.2.1
 
+  cac@6.7.14: {}
+
   chai@6.2.2: {}
 
   chalk@4.1.2:
@@ -2320,6 +2338,13 @@ snapshots:
 
   function-bind@1.1.2: {}
 
+  generate-jsdoc-example-tests@0.2.6:
+    dependencies:
+      '@microsoft/tsdoc': 0.15.1
+      cac: 6.7.14
+      prettier: 3.8.4
+      typescript: 5.9.3
+
   get-amd-module-type@6.0.2:
     dependencies:
       ast-module-types: 6.0.2
diff --git a/src/base/index.ts b/src/base/index.ts
index 54fa7bf..9e3cd5c 100644
--- a/src/base/index.ts
+++ b/src/base/index.ts
@@ -10,14 +10,27 @@ export type Base = T extends { [shim]: { value: infer U } }
 export type Fluent<
 	T,
 	Reg extends Registry = DefaultRegistry,
-> = Base & Methods;
+> = Base & Methods extends infer U
+	? U &
+			Pick<
+				{
+					/**
+					 * Immediate casts and conversions to other types.
+					 */
+					to: unknown;
+
+					[K: PropertyKey]: unknown;
+				},
+				keyof U
+			>
+	: never;
 
 export function makeFluent(
 	registry: Reg,
 ) {
 	const fluent = (value: T) => {
 		// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
-		const f = { value } as never as Fluent;
+		const f = { value } as unknown as Fluent;
 
 		for (const mixin of registry) {
 			// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
diff --git a/src/index.ts b/src/index.ts
index 505ddb5..ff0717c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,3 +2,4 @@ import { makeFluent } from "./base";
 import { DEFAULT_REGISTRY } from "./registry";
 
 export const fluent = makeFluent(DEFAULT_REGISTRY);
+export const $ = fluent;
diff --git a/src/internal.ts b/src/internal.ts
index 10b2b7b..4b17fa0 100644
--- a/src/internal.ts
+++ b/src/internal.ts
@@ -7,7 +7,7 @@ export interface Identity extends HKT {
 // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
 export const never = undefined as never;
 
-export type Constraint = U;
+export type MaxDepth = 20;
 
 export class AssertionError extends Error {
 	public constructor(msg?: string) {
diff --git a/src/mixin/array.ts b/src/mixin/array.ts
index d1cd3ff..f1bc9fe 100644
--- a/src/mixin/array.ts
+++ b/src/mixin/array.ts
@@ -141,7 +141,9 @@ export interface Array extends Mixin.HKT {
 					 * Index the array using the specified zero-based index.
 					 * Negative indexes start at the end of the array.
 					 * @param index Zero-based index
+					 * @from {@link Array `Array`}
 					 * @example
+					 * ```ts
 					 * const array = ["first", "middle", "last"] as const;
 					 *
 					 * const first = $(array).at(0).value;
@@ -154,16 +156,19 @@ export interface Array extends Mixin.HKT {
 					 *
 					 * const oob = $(array).at(10).value;
 					 * expect(oob).toBe(undefined);
-					 * @from {@link Array `Array`}
+					 * ```
 					 */
 					at: (
+						/** Zero-based index */
 						index: K,
 					) => Return, typeof t>;
 					/**
 					 * Interospect each item of the array using the specified
 					 * callback
-					 * @param callback Callback taking item, index, and the array for each item.
+					 * @param callback Function called with each element of the array
+					 * @from {@link Array `Array`}
 					 * @example
+					 * ```ts
 					 * const array = [4, 5, 6] as const;
 					 *
 					 * let sum = 0;
@@ -171,55 +176,84 @@ export interface Array extends Mixin.HKT {
 					 *
 					 * expect(sum).toBe(15);
 					 * expect(v).toMatchObject(array);
-					 * @from {@link Array `Array`}
+					 * ```
 					 */
 					each: (
+						/**
+						 * Predicate to run on every element
+						 * @param element The current element
+						 * @param index The index of the current element in the array
+						 * @param array The array being iterated
+						 */
 						callback: (...args: IterArgs) => void,
 					) => Return;
 					/**
 					 * Transform each item of the array using the specified callback
-					 * @param callback Transformative callback taking item, index, and array; returns the new item
+					 * @param callback Predicate to compute each new value with
+					 * @from {@link Array `Array`}
 					 * @example
+					 * ```ts
 					 * const chars = ["h", "e", "l", "l", "o"] as const;
 					 *
 					 * const v = $(chars).map(ch => ch.toUpperCase()).value;
 					 * expect(v).toMatchObject(["H", "E", "L", "L", "O"]);
-					 * @from {@link Array `Array`}
+					 * ```
 					 */
 					map: (
+						/**
+						 * Predicate to compute each new value of the array
+						 * @param element The current element
+						 * @param index The index of the current element in the array
+						 * @param array The array being iterated
+						 * @return The new value to use for this element
+						 */
 						callback: (...args: IterArgs) => U,
 					) => Return, typeof t>;
 					/**
 					 * Extend the array by repeating its current contents n times
-					 * @param count The number of repetitions to add
+					 * @param count The amount of repetitions to extend the array by
+					 * @from {@link Array `Array`}
 					 * @example
+					 * ```ts
 					 * const array = [1, 2];
 					 *
 					 * const v = $(array).extend(2).value;
 					 * expect(v).toMatchObject([1, 2, 1, 2, 1, 2]);
-					 * @from {@link Array `Array`}
+					 * ```
 					 */
 					extend: (
+						/** The amount of repetitions to extend the array by */
 						count: N,
 					) => Return, typeof t>;
 					/**
 					 * Filter the array to contain only items satisfying the
 					 * specified callback conditional
-					 * @param callback Callback getting item, index, and array for each item and determining if it should be filtered out or not
+					 * @param callback Predicate determining whether each element should be kept in the array
+					 * @from {@link Array `Array`}
 					 * @example
+					 * ```ts
 					 * const dirty = [-2, 4, 1, -5, -6] as const;
 					 *
 					 * const v = $(dirty).filter(v => v >= 0).value;
 					 * expect(v).toMatchObject([4, 1]);
-					 * @from {@link Array `Array`}
+					 * ```
 					 */
 					filter: ((
+						/**
+						 * Predicate to compute filtering with
+						 * @param element The current element
+						 * @param index The index of the current element in the array
+						 * @param array The array being iterated
+						 * @return `true` if the value should be kept and `false` if it should not
+						 */
 						callback: (...args: IterArgs) => boolean,
 					) => Return, typeof t>) & {
 						/**
 						 * Filter the array to only contain items which are not
 						 * `null` or `undefined`.
+						 * @from {@link Array `Array`}
 						 * @example
+						 * ```ts
 						 * const array = new Array(5);
 						 *
 						 * array[0] = 1;
@@ -228,7 +262,7 @@ export interface Array extends Mixin.HKT {
 						 *
 						 * const v = $(array).filter.some().value;
 						 * expect(v).toMatchObject([1, 5, 2]);
-						 * @from {@link Array `Array`}
+						 * ```
 						 */
 						some: () => Return<
 							T extends unknown[]
@@ -243,23 +277,106 @@ export interface Array extends Mixin.HKT {
 							typeof t
 						>;
 					} & HidePrototype;
+					/**
+					 * Collapse array into one value using the specified accumulator callback
+					 * @param initial The initial value of the accumulator
+					 * @param callback Predicate used to compute the new value of the accumulator with each element
+					 * @from {@link Array `Array`}
+					 * @example
+					 * ```ts
+					 * const data = [-5, -4, -2, 1, 2, 3, 5] as const;
+					 *
+					 * const sum = $(data)
+					 * 	.reduce(0, (total, value) => total + value)
+					 * 	.value;
+					 * expect(sum).toBe(0);
+					 * ```
+					 */
 					reduce: ((
+						/**
+						 * Initial value to use for the accumulator
+						 */
 						initial: U,
+						/**
+						 * Predicate to compute the new accumulator value
+						 * @param value The current status of the accumulator
+						 * @param element The current element
+						 * @param index The index of the current element in the array
+						 * @param array The array being iterated
+						 */
 						callback: (
 							value: U,
 							...args: IterArgs
 						) => U,
 					) => Return) & {
+						/**
+						 * Collapse the array using the specified accumulator function, starting from the right.
+						 * @param initial The initial value of the accumulator
+						 * @param callback Predicate used to compute the new value of the accumulator with each element
+						 * @see `.reduce()`
+						 * @example
+						 * ```ts
+						 * const path = ["a", "b", "c"] as const;
+						 *
+						 * const v = $(path)
+						 * 	.reduce.right({}, (obj, key) => ({ [key]: obj }))
+						 * 	.value;
+						 * expect(v).toMatchObject({ a: { b: { c: { } } } });
+						 * ```
+						 */
 						right: (
+							/**
+							 * Initial value to use for the accumulator
+							 */
 							initial: U,
-							callback: (
-								value: U,
-								...args: IterArgs
-							) => U,
+							/**
+							 * Predicate to compute the new accumulator value
+							 * @param value The current status of the accumulator
+							 * @param element The current element
+							 * @param index The index of the current element in the array
+							 * @param array The array being iterated
+							 */
 						) => Return;
 					} & HidePrototype;
+					/**
+					 * Get the number of items in the array
+					 * @example
+					 * ```ts
+					 * const apples = ["red", "green", "yellow"];
+					 *
+					 * const count = $(apples).length().value;
+					 * expect(count).toBe(3);
+					 * ```
+					 */
 					length: () => Return;
+
+					/**
+					 * Rearrange the items in the array in accordance to the
+					 * specified sorting function
+					 * @param sort The sorting algorithm function to determine the correct order of elements
+					 * @see Nested properties for various pre-made sorting algorithms.
+					 * @from {@link Array `Array`}
+					 * @example
+					 * ```ts
+					 * const unordered = [7, 2, 4, 6, 3, 5, 1];
+					 *
+					 * const ordered = $(unordered)
+					 * 	.sort((a, b) => a - b)
+					 * 	.value;
+					 * expect(ordered).toMatchObject([1, 2, 3, 4, 5, 6, 7]);
+					 * ```
+					 */
 					sort: ((
+						/**
+						 * Predicate used to compare and determine the ordering
+						 * between any 2 elements of the array
+						 * @param a One element of the array to comapare
+						 * @param b Another element of the array to compare against
+						 * @param arr A view of the array being sorted
+						 * @return A negative value if `a` should come before
+						 * `b`, a positive value if `a` should come after `b`,
+						 * and `0` if `a` and `b` are considered the same.
+						 */
 						callback: (
 							a: Item,
 							b: Item,
@@ -268,13 +385,33 @@ export interface Array extends Mixin.HKT {
 					) => Return, typeof t>) &
 						([Item] extends [string]
 							? {
-									alpha: () => Return<
+									/**
+									 * @param via A callback to compute a
+									 * representation of each element to use for
+									 * sorting
+									 */
+									alpha: (
+										/**
+										 * @param v The current element
+										 * @return A string representation of `v`
+										 */
+										via?: (v: Item) => string,
+									) => Return<
 										Unordered,
 										typeof t
 									>;
 								}
 							: {
+									/**
+									 * @param via A callback to map each element
+									 * of the array to a string that is used for
+									 * sorting
+									 */
 									alpha: (
+										/**
+										 * @param v The current element
+										 * @return The string representation of `v`
+										 */
 										via: (v: Item) => string,
 									) => Return<
 										Unordered,
@@ -305,8 +442,19 @@ export interface Array extends Mixin.HKT {
 										Unordered,
 										typeof t
 									>;
-								}) &
-						HidePrototype;
+								}) & {
+							/**
+							 * Sort alphabetically (A-Z) by Unicode code points
+							 * @example
+							 * const names = ["Johnny", "Anna", "Bart", "Xavier", "Java"];
+							 *
+							 * const sorted = $(names).sort.alpha().value;
+							 * expect(sorted).toMatchObject([
+							 * 	"Anna", "Bart", "Java", "Johnny", "Xavier"
+							 * ])
+							 */
+							alpha: unknown;
+						} & HidePrototype;
 					reverse: () => Return, typeof t>;
 				}
 			: unknown
@@ -328,7 +476,9 @@ export const Array = Mixin((value, $, fluent) => {
 		assert(count >= 0);
 		if (count === 0) return fluent(value);
 		return fluent(
-			value.concat(...new globalThis.Array(count).fill(value)),
+			value.concat(
+				...new globalThis.Array(count).fill(value),
+			),
 		);
 	};
 
@@ -388,9 +538,7 @@ export const Array = Mixin((value, $, fluent) => {
 			),
 		) => {
 			return fluent(
-				value.toSorted((a, b) =>
-					via(a)! < via(b)! ? -1 : 1,
-				),
+				value.toSorted((a, b) => (via(a) < via(b) ? -1 : 1)),
 			);
 		},
 		ascending: (
@@ -450,14 +598,17 @@ if (import.meta.vitest) {
 	});
 
 	test("extend()", () => {
-		const arr = [1, 2] as const;
+		const arr = [1, 2];
 
 		const copies = 2;
-		const expected: number[] = new globalThis.Array(copies + 1)
+		const expected: number[] = new globalThis.Array(
+			copies + 1,
+		)
 			.fill(arr)
 			.flat(1);
 
 		expect($(arr).extend(copies).value).toMatchObject(expected);
+		expect($(arr).extend(0).value).toBe(arr);
 	});
 
 	test("map()", () => {
@@ -518,7 +669,8 @@ if (import.meta.vitest) {
 				i,
 				arr,
 			);
-			sum += arr[i]!;
+
+			sum += arr[i];
 		}
 
 		callback.mockClear();
@@ -526,7 +678,7 @@ if (import.meta.vitest) {
 		expect($(arr).reduce.right(0, callback).value).toBe(expected);
 
 		sum = 0;
-		for (let i = arr.length; i > 0; i--) {
+		for (let i: number = arr.length; i > 0; i--) {
 			expect(callback).toHaveBeenNthCalledWith(
 				arr.length - i + 1,
 				sum,
@@ -534,7 +686,7 @@ if (import.meta.vitest) {
 				i - 1,
 				arr,
 			);
-			sum += arr[i - 1]!;
+			sum += arr[i - 1];
 		}
 	});
 
@@ -580,4 +732,19 @@ if (import.meta.vitest) {
 			strings.toSorted(),
 		);
 	});
+
+	test("reverse()", () => {
+		const array = [1, 2, 3, 4, 5] as const;
+
+		expect($(array).reverse().value).toMatchObject(
+			array.toReversed(),
+		);
+	});
+
+	test("length()", () => {
+		const length = 3;
+		const array = new globalThis.Array(length).fill(5);
+
+		expect($(array).length().value).toBe(length);
+	});
 }
diff --git a/src/mixin/base.ts b/src/mixin/base.ts
index 4b22c31..75c8ad0 100644
--- a/src/mixin/base.ts
+++ b/src/mixin/base.ts
@@ -10,13 +10,15 @@ export interface Base extends Mixin.HKT {
 				 * modifying the value.
 				 * @param callback The interospective callback
 				 * @see `transform` to modify
+				 * @from {@link Base `Base`}
 				 * @example
+				 * ```ts
 				 * let x;
 				 * const value = $(10).tap(v => { x = ++v }).value;
 				 *
 				 * expect(x).toBe(11);
 				 * expect(value).toBe(10);
-				 * @from {@link Base `Base`}
+				 * ```
 				 */
 				tap(
 					callback: (value: Readonly) => void,
@@ -26,12 +28,14 @@ export interface Base extends Mixin.HKT {
 				 * `callback` using the outputted return value as a new value.
 				 * A.K.A., _transform_ the current value using a callback
 				 * @param callback The transformative callback
+				 * @from {@link Base `Base`}
 				 * @example
+				 * ```ts
 				 * const value = $("Hello")
 				 * 	.transform(v => v.toUpperCase())
 				 * 	.value;
 				 * expect(value).toBe("HELLO");
-				 * @from {@link Base `Base`}
+				 * ```
 				 */
 				transform(
 					callback: (value: T) => U,
diff --git a/src/mixin/index.ts b/src/mixin/index.ts
deleted file mode 100644
index 01b124e..0000000
--- a/src/mixin/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export { Base } from "./base";
-export { AsyncMixin as Async } from "./awaited";
-export { Optional } from "./optional";
diff --git a/src/mixin/math.ts b/src/mixin/math.ts
index e69de29..c365367 100644
--- a/src/mixin/math.ts
+++ b/src/mixin/math.ts
@@ -0,0 +1,297 @@
+import { makeFluent } from "../base";
+import type { HKT } from "../base/hkt";
+import {
+	Mixin,
+	type Input,
+	type Props,
+	type Return,
+} from "../base/mixin";
+import { assertType } from "../internal";
+import { applySwizzle, type Swizzle } from "./math/swizzle";
+
+type Sign = T extends 0
+	? 0
+	: `${T}` extends `-${number}`
+		? -1
+		: 1;
+
+export interface Math extends Mixin.HKT {
+	new: (t: HKT.T) => Input extends infer T
+		? T extends number
+			? {
+					add: (other: number) => Return;
+					subtract: (
+						other: number,
+					) => Return;
+					multiply: (
+						factor: number,
+					) => Return;
+					pow: (
+						exponent: number,
+					) => Return;
+					sqrt: () => Return;
+					divide: (
+						divisor: number,
+					) => Return;
+					mod: (
+						divisor: number,
+					) => Return;
+					log: (base?: number) => Return;
+
+					isEqualApprox: (
+						other: number,
+						delta?: number,
+					) => Return;
+
+					floor: () => Return;
+					ceil: () => Return;
+					round: () => Return;
+					fround: () => Return;
+
+					abs: () => Return;
+					negate: () => Return;
+					sign: () => Return, typeof t>;
+
+					min: (
+						...others: number[]
+					) => Return;
+					max: (
+						...others: number[]
+					) => Return;
+					clamp: (
+						min: number,
+						max: number,
+					) => Return;
+					snapped: (
+						multiple: number,
+					) => Return;
+
+					lerp: typeof t extends infer TProps extends Props
+						? (
+								b: number,
+								t: number,
+							) => Return
+						: never;
+
+					sin: () => Return;
+					asin: () => Return;
+					cos: () => Return;
+					acos: () => Return;
+					tan: () => Return;
+					atan: () => Return;
+					atan2: (y: number) => Return;
+
+					sinh: () => Return;
+					asinh: () => Return;
+					cosh: () => Return;
+					acosh: () => Return;
+					tanh: () => Return;
+					atanh: () => Return;
+
+					to: {
+						radians: () => Return;
+						degrees: () => Return;
+					};
+				}
+			: T extends readonly number[]
+				? Swizzle & {
+						sum: () => Return;
+					}
+				: unknown
+		: never;
+}
+
+const M = globalThis.Math;
+
+export const Math = Mixin((value, $, fluent) => {
+	if (typeof value === "number") {
+		$.add = (other: number) => fluent(value + other);
+		$.subtract = (other: number) => fluent(value - other);
+		$.multiply = (factor: number) => fluent(value * factor);
+		$.pow = (exponent: number) => fluent(M.pow(value, exponent));
+		$.sqrt = () => fluent(M.sqrt(value));
+		$.divide = (divisor: number) => fluent(value / divisor);
+		$.mod = (divisor: number) => fluent(value % divisor);
+		$.log = (base?: number) => {
+			if (base !== undefined)
+				return fluent(M.log(value) / M.log(base));
+			return fluent(M.log(value));
+		};
+
+		$.isEqualApprox = (
+			other: number,
+			delta: number = Number.EPSILON,
+		) => {
+			return fluent(M.abs(value - other) < delta);
+		};
+
+		$.floor = () => fluent(M.floor(value));
+		$.ceil = () => fluent(M.ceil(value));
+		$.round = () => fluent(M.round(value));
+		$.fround = () => fluent(M.fround(value));
+
+		$.abs = () => fluent(M.abs(value));
+		$.negate = () => fluent(-value);
+		$.sign = () => fluent(M.sign(value));
+
+		$.min = (...others: number[]) =>
+			fluent(M.min(value, ...others));
+		$.max = (...others: number[]) =>
+			fluent(M.max(value, ...others));
+		$.clamp = (min: number, max: number) =>
+			fluent(M.min(M.max(value, min), max));
+		$.snapped = (multiple: number) =>
+			fluent(M.round(value / multiple) * multiple);
+
+		$.lerp = (b: number, t: number) =>
+			fluent(value * (1 - t) + b * t);
+
+		$.sin = () => fluent(M.sin(value));
+		$.asin = () => fluent(M.asin(value));
+		$.cos = () => fluent(M.cos(value));
+		$.acos = () => fluent(M.acos(value));
+		$.tan = () => fluent(M.tan(value));
+		$.atan = () => fluent(M.atan(value));
+		$.atan2 = (y: number) => fluent(M.atan2(y, value));
+
+		$.sinh = () => fluent(M.sinh(value));
+		$.asinh = () => fluent(M.asinh(value));
+		$.cosh = () => fluent(M.cosh(value));
+		$.acosh = () => fluent(M.acosh(value));
+		$.tanh = () => fluent(M.tanh(value));
+		$.atanh = () => fluent(M.atanh(value));
+
+		const DEG_TO_RAD = M.PI / 180;
+		const RAD_TO_DEG = 180 / M.PI;
+
+		$.to ??= {};
+		assertType($.to);
+		Object.assign($.to, {
+			radians: () => fluent(value * DEG_TO_RAD),
+			degrees: () => fluent(value * RAD_TO_DEG),
+		});
+	} else if (
+		Array.isArray(value) &&
+		value.every((x) => typeof x === "number")
+	) {
+		applySwizzle(value, $, fluent);
+	}
+});
+
+if (import.meta.vitest) {
+	const { test, expect } = import.meta.vitest;
+
+	const registry = [Math] as const;
+	const $ = makeFluent(registry);
+
+	const t = (f: string, a: number, ...args: unknown[]) => {
+		test(f + "()", () => {
+			// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion, @typescript-eslint/no-explicit-any, @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-unsafe-call
+			expect(($(a) as any)[f](...args.slice(0, -1)).value).toBe(
+				args[args.length - 1],
+			);
+		});
+	};
+
+	t("add", 4, 5, 4 + 5);
+	t("subtract", 7, 2, 7 - 2);
+	t("multiply", 3, 3, 3 * 3);
+	t("pow", 2, 4, 2 ** 4);
+	t("sqrt", 121, M.sqrt(121));
+	t("mod", 8, 3, 8 % 3);
+	test("log()", () => {
+		expect($(M.E).log().value).toBe(1);
+		expect($(1000).log(10).value).toBeCloseTo(M.log10(1000));
+	});
+
+	test("equalApprox()", () => {
+		const a = 0.1 + 0.2;
+		const target = 0.3;
+
+		expect($(a).isEqualApprox(target).value).toBe(true);
+
+		expect($(a).isEqualApprox(1, 1).value).toBe(true);
+
+		expect(
+			$(a).isEqualApprox(target + Number.EPSILON * 2).value,
+		).toBe(false);
+	});
+
+	t("floor", 1.7, 1);
+	t("ceil", 1.7, 2);
+	test("round()", () => {
+		expect($(1.3).round().value).toBe(1);
+		expect($(4.5).round().value).toBe(5);
+	});
+	t("fround", 6.45, M.fround(6.45));
+
+	test("abs()", () => {
+		const v = 4;
+
+		expect($(v).abs().value).toBe(v);
+		expect($(-v).abs().value).toBe(v);
+	});
+	test("negate()", () => {
+		const v = 7;
+
+		expect($(v).negate().value).toBe(-v);
+		expect($(v).negate().negate().value).toBe(v);
+	});
+	test("sign()", () => {
+		expect($(-4).sign().value).toBe(-1);
+		expect($(0).sign().value).toBe(0);
+		expect($(6).sign().value).toBe(1);
+	});
+
+	t("min", 3, 1, 2, 1);
+	t("max", 3, 1, 2, 3);
+	test("clamp()", () => {
+		const min = 1;
+		const max = 4;
+
+		const v = 3;
+
+		expect($(min - 4).clamp(min, max).value).toBe(min);
+		expect($(v).clamp(min, max).value).toBe(v);
+		expect($(max + 7).clamp(min, max).value).toBe(max);
+	});
+	t("snapped", 12.345, 0.1, 12.3);
+
+	test("lerp()", () => {
+		const a = 2;
+		const b = 4;
+
+		expect($(a).lerp(b, 0).value).toBe(a);
+		expect($(a).lerp(b, 0.5).value).toBe(3);
+		expect($(a).lerp(b, 1).value).toBe(b);
+
+		expect($(a).lerp(b, 2).value).toBe(b + (b - a));
+		expect($(a).lerp(b, -1).value).toBe(0);
+	});
+
+	t("sin", M.PI, M.sin(M.PI));
+	t("cos", M.PI, M.cos(M.PI));
+	t("acos", M.PI, M.acos(M.PI));
+	t("tan", M.PI, M.tan(M.PI));
+	t("atan", M.PI, M.atan(M.PI));
+	t("atan2", 10, M.PI, M.atan2(M.PI, 10));
+
+	t("sinh", M.PI, M.sinh(M.PI));
+	t("asinh", M.PI, M.asinh(M.PI));
+	t("cosh", M.PI, M.cosh(M.PI));
+	t("acosh", M.PI, M.acosh(M.PI));
+	t("tanh", M.PI, M.tanh(M.PI));
+	t("atanh", 0.5, M.atanh(0.5));
+
+	test(".to.radians()", () => {
+		const angle = 180;
+
+		expect($(angle).to.radians().value).toBe(M.PI);
+	});
+
+	test(".to.degrees()", () => {
+		const angle = M.PI;
+
+		expect($(angle).to.degrees().value).toBe(180);
+	});
+}
diff --git a/src/mixin/math/swizzle.ts b/src/mixin/math/swizzle.ts
new file mode 100644
index 0000000..86528a3
--- /dev/null
+++ b/src/mixin/math/swizzle.ts
@@ -0,0 +1,272 @@
+import { makeFluent } from "../../base";
+import type { Props, Return } from "../../base/mixin";
+import { type MaxDepth } from "../../internal";
+import { Math } from "../math";
+
+type Axis = typeof axis;
+type Vec<
+	T,
+	N extends number,
+	TOut extends T[] = [],
+> = TOut["length"] extends N
+	? TOut
+	: TOut["length"] extends MaxDepth
+		? T[]
+		: Vec;
+
+type Inc = N extends number
+	? [...Vec, null]["length"]
+	: 0;
+type Dec =
+	Vec extends [...infer Rest extends null[], null]
+		? Rest["length"]
+		: -1;
+
+type Next<
+	N extends number,
+	State extends readonly (number | undefined)[],
+	TOut extends (number | undefined)[] = [],
+> = State extends readonly [
+	infer Current extends number | undefined,
+	...infer Rest extends (number | undefined)[],
+]
+	? Inc extends infer TInc
+		? TInc extends N
+			? Next
+			: [...TOut, TInc, ...Rest]
+		: never
+	: null;
+
+type Key<
+	State extends (number | undefined)[],
+	TOut extends string = "",
+> = State extends readonly [infer Only extends number, ...undefined[]]
+	? `${TOut}${Axis[Only]}`
+	: State extends readonly [
+				infer Current extends number,
+				...infer Rest extends (number | undefined)[],
+		  ]
+		? Key
+		: never;
+
+type IsAscending<
+	State extends (number | undefined)[],
+	Prev extends number | undefined = undefined,
+> = State extends readonly [
+	infer Current extends number,
+	...infer Rest extends number[],
+]
+	? Current extends Inc
+		? IsAscending>
+		: false
+	: State extends readonly []
+		? true
+		: false;
+
+type Pretty = { [K in keyof T]: T[K] };
+
+type SwizzlePermutations<
+	N extends number,
+	State extends Vec = Vec,
+	TOut extends Record = Record<
+		never,
+		never
+	>,
+> =
+	Next extends infer TNext
+		? TNext extends Vec
+			? SwizzlePermutations<
+					N,
+					TNext,
+					TOut &
+						(IsAscending extends true
+							? unknown
+							: Record, State>)
+				>
+			: Pretty, State>>
+		: never;
+
+type Sequence<
+	T extends readonly unknown[],
+	Indexes extends (number | undefined)[],
+	TOut extends T[number][] = [],
+> = Indexes extends readonly [
+	infer Current extends number,
+	...infer Rest extends (number | undefined)[],
+]
+	? Sequence
+	: TOut;
+
+type Primative<
+	T extends readonly unknown[],
+	t extends Props,
+	Axes extends readonly string[] = Axis,
+	Acc = unknown,
+	TOut extends unknown[] = [],
+> = Axes extends readonly [
+	infer Current extends string,
+	...infer Rest extends string[],
+]
+	? Acc &
+			Record<
+				Current,
+				Return
+			> extends infer TAcc
+		? Primative
+		: never
+	: TOut;
+
+type SwizzleCache = [
+	{ x: [0] },
+	SwizzlePermutations<2>,
+	SwizzlePermutations<3>,
+	SwizzlePermutations<4>,
+];
+
+export type Swizzle<
+	T extends readonly unknown[],
+	t extends Props,
+> = number extends T["length"]
+	? unknown
+	: (
+				Dec extends infer K extends 0 | 1 | 2 | 3
+					? { k: K; c: SwizzleCache[K] }
+					: SwizzleCache extends [...unknown[], infer Last]
+						? { k: Dec; c: Last }
+						: never
+		  ) extends {
+				k: infer K extends number;
+				c: infer C extends Record<
+					PropertyKey,
+					(number | undefined)[]
+				>;
+		  }
+		? Omit<
+				{
+					readonly [K in keyof C]: Return<
+						Sequence,
+						t
+					>;
+				},
+				Axis[number]
+			> &
+				Primative[K]
+		: never;
+
+const axis = ["x", "y", "z", "w"] as const;
+
+export function applySwizzle(
+	value: number[],
+	$: object,
+	fluent: (value: unknown) => never,
+) {
+	const length = value.length;
+	const state = new Array(length).fill(-1);
+
+	main: do {
+		for (let i = 0; i < state.length; i++) {
+			state[i] += 1;
+			if (state[i] >= length) state[i] = -1;
+			else break;
+		}
+
+		let reachedEmpty = false;
+		for (const item of state) {
+			if (item === -1) {
+				reachedEmpty = true;
+			} else if (reachedEmpty) {
+				continue main;
+			}
+		}
+
+		const key = state
+			.filter((x) => x !== -1)
+			.map((x) => axis[x])
+			.join("");
+		if (key.length <= 1 || key in $) continue;
+		const permutation = state
+			.filter((x) => x !== -1)
+			.map((x) => value[x]);
+		Object.defineProperty($, key, {
+			get: () => {
+				// OPTIMIZE? Reduce amount of arrays allocated and held for the lambda..?
+				return fluent(permutation);
+			},
+		});
+	} while (state.some((x) => x !== -1));
+
+	Object.defineProperty($, "x", {
+		get: () => {
+			return fluent(value[0]);
+		},
+	});
+	Object.defineProperty($, "y", {
+		get: () => {
+			return fluent(value[1]);
+		},
+	});
+	Object.defineProperty($, "z", {
+		get: () => {
+			return fluent(value[2]);
+		},
+	});
+	Object.defineProperty($, "w", {
+		get: () => {
+			return fluent(value[3]);
+		},
+	});
+}
+
+if (import.meta.vitest) {
+	const { test, expect } = import.meta.vitest;
+
+	const registry = [Math] as const;
+	const $ = makeFluent(registry);
+
+	test("Swizzling (.xx, .xy, etc.)", () => {
+		const x = 5 as const;
+		const y = 7 as const;
+
+		const vec = [x, y] as const;
+
+		expect($(vec).xx.value).toMatchObject([x, x]);
+		expect($(vec).yx.value).toMatchObject([y, x]);
+		expect($(vec).yy.value).toMatchObject([y, y]);
+
+		const large = [x, y, x, y] as const;
+
+		expect($(large).wzyx.value).toMatchObject([y, x, y, x]);
+		expect($(large).xzyw.value).toMatchObject([x, x, y, y]);
+		expect($(large).ywxz.value).toMatchObject([y, y, x, x]);
+		expect($(large).xxxx.value).toMatchObject([x, x, x, x]);
+		expect($(large).wwww.value).toMatchObject([y, y, y, y]);
+	});
+
+	test(".x", () => {
+		const x = 5 as const;
+		const arr = [x] as const;
+
+		expect($(arr).x.value).toBe(x);
+	});
+
+	test(".y", () => {
+		const y = 2 as const;
+		const arr = [y, y] as const;
+
+		expect($(arr).y.value).toBe(y);
+	});
+
+	test(".z", () => {
+		const z = 9 as const;
+		const arr = [z, z, z] as const;
+
+		expect($(arr).z.value).toBe(z);
+	});
+
+	test(".w", () => {
+		const w = 0 as const;
+		const arr = [w, w, w, w] as const;
+
+		expect($(arr).w.value).toBe(w);
+	});
+}
diff --git a/src/mixin/optional.ts b/src/mixin/optional.ts
index 76bb3f2..93831df 100644
--- a/src/mixin/optional.ts
+++ b/src/mixin/optional.ts
@@ -85,7 +85,7 @@ export interface Optional extends Mixin.HKT {
 					 * expect(b).toBe(10);
 					 * @from {@link Optional `Optional`}
 					 */
-					or: ((
+					or: ((
 						fallback: U,
 					) => Return | U, typeof t>) & {
 						/**
@@ -94,11 +94,13 @@ export interface Optional extends Mixin.HKT {
 						 * only computes the fallback if the value is `null` or
 						 * `undefined`
 						 * @param callback
+						 * @from {@link Optional `Optional`}
 						 * @example
+						 * ```ts
 						 * const none = () => null as number | null;
 						 * const some = () => 8 as number | null;
 						 *
-						 * const fallback = () => 22; // mocked
+						 * const fallback = vi.fn(() => 22); // mocked
 						 *
 						 * const a = $(none()).or.else(fallback).value;
 						 * expect(a).toBe(22);
@@ -107,7 +109,7 @@ export interface Optional extends Mixin.HKT {
 						 * expect(b).toBe(8);
 						 *
 						 * expect(fallback).toHaveBeenCalledOnce()
-						 * @from {@link Optional `Optional`}
+						 * ```
 						 */
 						else: (
 							callback: (v: None) => U,
@@ -116,7 +118,10 @@ export interface Optional extends Mixin.HKT {
 					/**
 					 * Assert that value is not `null` or `undefined`
 					 * @param msg Reasoning to attach to the `AssertionError`
+					 * @see `.assert.none()` for the inverse assertion
+					 * @from {@link Optional `Optional`}
 					 * @example
+					 * ```ts
 					 * const array = [1, 2, 3];
 					 * const element: number | undefined = array[1];
 					 *
@@ -126,8 +131,7 @@ export interface Optional extends Mixin.HKT {
 					 * expect(() => {
 					 *  $(array[6]).assert()
 					 * }).toThrow()
-					 * @see `.assert.none()` for the inverse assertion
-					 * @from {@link Optional `Optional`}
+					 * ```
 					 */
 					assert: ((
 						msg?: string,
@@ -135,7 +139,9 @@ export interface Optional extends Mixin.HKT {
 						/**
 						 * Assert that the value is either `null` or `undefined`
 						 * @param msg Reasoning to attach to the `AssertionError`
+						 * @from {@link Optional `Optional`}
 						 * @example
+						 * ```ts
 						 * const array = [1, 2, 3];
 						 * const element: number | undefined = array[5];
 						 *
@@ -145,6 +151,7 @@ export interface Optional extends Mixin.HKT {
 						 * expect(() => {
 						 *  $(array[1]).assert.none()
 						 * }).toThrow()
+						 * ```
 						 */
 						none: (
 							msg?: string,
@@ -170,13 +177,13 @@ export const Optional = Mixin((value, $, fluent) => {
 			},
 		});
 
-		$.assert = () => {
-			return fluent(value);
+		$.assert = (msg?: string) => {
+			assert(false, msg);
 		};
 		assertType($.assert);
 		Object.assign($.assert, {
-			none: (msg?: string) => {
-				assert(false, msg);
+			none: () => {
+				return fluent(value);
 			},
 		});
 	} else {
@@ -195,13 +202,13 @@ export const Optional = Mixin((value, $, fluent) => {
 			},
 		});
 
-		$.assert = (msg?: string) => {
-			assert(false, msg);
+		$.assert = () => {
+			return fluent(value);
 		};
 		assertType($.assert);
 		Object.assign($.assert, {
 			none: (msg?: string) => {
-				return fluent(value);
+				assert(false, msg);
 			},
 		});
 	}
diff --git a/src/registry.ts b/src/registry.ts
index 140465e..2e3b2e5 100644
--- a/src/registry.ts
+++ b/src/registry.ts
@@ -1,6 +1,9 @@
 import { Mixin, type Instansiate } from "./base/mixin";
-import { Async, Base, Optional } from "./mixin";
 import { Array } from "./mixin/array";
+import { AsyncMixin as Async } from "./mixin/awaited";
+import { Base } from "./mixin/base";
+import { Math } from "./mixin/math";
+import { Optional } from "./mixin/optional";
 
 export type Registry = readonly Mixin[];
 
@@ -9,6 +12,7 @@ export const DEFAULT_REGISTRY = [
 	Array,
 	Base,
 	Optional,
+	Math,
 ] as const satisfies Registry;
 export type DefaultRegistry = typeof DEFAULT_REGISTRY;
 
diff --git a/tsconfig.app.json b/tsconfig.app.json
index a4e7f6c..acad168 100644
--- a/tsconfig.app.json
+++ b/tsconfig.app.json
@@ -17,7 +17,7 @@
 
 		/* Linting */
 		"noUnusedLocals": false,
-		"noUncheckedIndexedAccess": true,
+		"noUncheckedIndexedAccess": false,
 		"erasableSyntaxOnly": true,
 	},
 	"include": ["src", "tests"]