@fedify/fedify
Version:
An ActivityPub server framework
37 lines (36 loc) • 1.05 kB
JavaScript
// Copyright 2018-2025 the Deno authors. MIT license.
// This module is browser compatible.
/**
* Returns `true` if the suffix array appears at the end of the source array,
* `false` otherwise.
*
* The complexity of this function is `O(suffix.length)`.
*
* @param source Source array to check.
* @param suffix Suffix array to check for.
* @returns `true` if the suffix array appears at the end of the source array,
* `false` otherwise.
*
* @example Basic usage
* ```ts
* import { endsWith } from "@std/bytes/ends-with";
* import { assertEquals } from "@std/assert";
*
* const source = new Uint8Array([0, 1, 2, 1, 2, 1, 2, 3]);
* const suffix = new Uint8Array([1, 2, 3]);
*
* assertEquals(endsWith(source, suffix), true);
* ```
*/
export function endsWith(source, suffix) {
const diff = source.length - suffix.length;
if (diff < 0) {
return false;
}
for (let i = suffix.length - 1; i >= 0; i--) {
if (source[diff + i] !== suffix[i]) {
return false;
}
}
return true;
}