std/bytes/mod.ts

Deno standard library
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function startsWith
import { startsWith } from "https://deno.land/std@0.139.0/bytes/mod.ts?s=startsWith";

Returns true if the prefix array appears at the start of the source array, false otherwise.

The complexity of this function is O(prefix.length).

import { startsWith } from "./mod.ts";
const source = new Uint8Array([0, 1, 2, 1, 2, 1, 2, 3]);
const prefix = new Uint8Array([0, 1, 2]);
console.log(startsWith(source, prefix)); // true

Parameters

source: Uint8Array[src]
prefix: Uint8Array[src]