locutus/esm/elixir/Enum/zip.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function zip(left, right) {
    //      discuss at: https://locutus.io/elixir/zip/
    // parity verified: Elixir 1.18
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //       example 1: zip([1, 2], [3, 4])
    //       returns 1: [[1, 3], [2, 4]]
    //       example 2: zip([[1, 2], ['a', 'b'], [true, false]])
    //       returns 2: [[1, 'a', true], [2, 'b', false]]
    //       example 3: zip([1, 2, 3], ['a'])
    //       returns 3: [[1, 'a']]
    if (right !== undefined) {
        if (!Array.isArray(left) || !Array.isArray(right)) {
            return [];
        }
        const size = Math.min(left.length, right.length);
        const out = [];
        for (let i = 0; i < size; i++) {
            out.push([left[i], right[i]]);
        }
        return out;
    }
    if (!Array.isArray(left) || left.length === 0) {
        return [];
    }
    if (!left.every((value) => Array.isArray(value))) {
        return [];
    }
    const lists = left;
    const size = Math.min(...lists.map((value) => value.length));
    const out = [];
    for (let i = 0; i < size; i++) {
        out.push(lists.map((value) => value[i]));
    }
    return out;
}