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std/bytes/equals.ts

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** Check whether binary arrays are equal to each other using 8-bit comparisons. * @private * @param a first array to check equality * @param b second array to check equality */function equalsNaive(a: Uint8Array, b: Uint8Array): boolean { for (let i = 0; i < b.length; i++) { if (a[i] !== b[i]) return false; } return true;}
/** Check whether binary arrays are equal to each other using 32-bit comparisons. * @private * @param a first array to check equality * @param b second array to check equality */function equals32Bit(a: Uint8Array, b: Uint8Array): boolean { const len = a.length; const compressible = Math.floor(len / 4); const compressedA = new Uint32Array(a.buffer, 0, compressible); const compressedB = new Uint32Array(b.buffer, 0, compressible); for (let i = compressible * 4; i < len; i++) { if (a[i] !== b[i]) return false; } for (let i = 0; i < compressedA.length; i++) { if (compressedA[i] !== compressedB[i]) return false; } return true;}
/** Check whether binary arrays are equal to each other. * @param a first array to check equality * @param b second array to check equality */export function equals(a: Uint8Array, b: Uint8Array): boolean { if (a.length !== b.length) { return false; } return a.length < 1000 ? equalsNaive(a, b) : equals32Bit(a, b);}