@deno/kv/esm/deps/deno.land/std@0.208.0/bytes/concat.js

A Deno KV client library optimized for Node.js.

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
export function concat(...buf) {
    /**
     * @todo(iuioiua): Revert to the old implementation upon removal of the
     * spread signatures.
     *
     * @see {@link https://github.com/denoland/deno_std/blob/e6c61ba64d547b60076422bbc1f6ad33184cc10a/bytes/concat.ts}
     */
    // No need to concatenate if there is only one element in array or sub-array
    if (buf.length === 1) {
        if (!Array.isArray(buf[0])) {
            return buf[0];
        }
        else if (buf[0].length === 1) {
            return buf[0][0];
        }
    }
    let length = 0;
    for (const b of buf) {
        if (Array.isArray(b)) {
            for (const b1 of b) {
                length += b1.length;
            }
        }
        else {
            length += b.length;
        }
    }
    const output = new Uint8Array(length);
    let index = 0;
    for (const b of buf) {
        if (Array.isArray(b)) {
            for (const b1 of b) {
                output.set(b1, index);
                index += b1.length;
            }
        }
        else {
            output.set(b, index);
            index += b.length;
        }
    }
    return output;
}