locutus/esm/php/array/array_pad.js

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

export function array_pad(input, padSize, padValue) {
    //      discuss at: https://locutus.io/php/array_pad/
    // parity verified: PHP 8.3
    //     original by: Waldo Malqui Silva (https://waldo.malqui.info)
    //       example 1: array_pad([ 7, 8, 9 ], 2, 'a')
    //       returns 1: [ 7, 8, 9]
    //       example 2: array_pad([ 7, 8, 9 ], 5, 'a')
    //       returns 2: [ 7, 8, 9, 'a', 'a']
    //       example 3: array_pad([ 7, 8, 9 ], 5, 2)
    //       returns 3: [ 7, 8, 9, 2, 2]
    //       example 4: array_pad([ 7, 8, 9 ], -5, 'a')
    //       returns 4: [ 'a', 'a', 7, 8, 9 ]
    let pad = [];
    const newArray = [];
    let newLength = 0;
    let diff = 0;
    let i = 0;
    if (Array.isArray(input) && !Number.isNaN(padSize)) {
        newLength = padSize < 0 ? padSize * -1 : padSize;
        diff = newLength - input.length;
        if (diff > 0) {
            for (i = 0; i < diff; i++) {
                newArray[i] = padValue;
            }
            pad = padSize < 0 ? [...newArray, ...input] : [...input, ...newArray];
        }
        else {
            pad = input;
        }
    }
    return pad;
}