locutus/esm/php/array/array_map.js

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

import { resolvePhpCallable } from "../_helpers/_callbackResolver.js";
export function array_map(callback, ...inputArrays) {
    //  discuss at: https://locutus.io/php/array_map/
    // original by: Andrea Giammarchi (https://webreflection.blogspot.com)
    // improved by: Kevin van Zonneveld (https://kvz.io)
    // improved by: Brett Zamir (https://brett-zamir.me)
    //    input by: thekid
    //      note 1: If the callback is a string (or object, if an array is supplied),
    //      note 1: it can only work if the function name is in the global context
    //   example 1: array_map( function (a){return (a * a * a)}, [1, 2, 3, 4, 5] )
    //   returns 1: [ 1, 8, 27, 64, 125 ]
    const argc = inputArrays.length + 1;
    const itemCount = inputArrays[0]?.length ?? 0;
    const resolved = callback === null || typeof callback === 'undefined'
        ? null
        : resolvePhpCallable(callback, {
            invalidMessage: 'array_map(): Invalid callback',
            missingScopeMessage: (scopeName) => 'Object not found: ' + scopeName,
        });
    if (resolved) {
        const mapped = [];
        for (let itemIndex = 0; itemIndex < itemCount; itemIndex++) {
            const args = [];
            for (let arrayIndex = 0; arrayIndex < argc - 1; arrayIndex++) {
                args.push(inputArrays[arrayIndex]?.[itemIndex]);
            }
            mapped[itemIndex] = resolved.fn.apply(resolved.scope, args);
        }
        return mapped;
    }
    const mapped = [];
    for (let itemIndex = 0; itemIndex < itemCount; itemIndex++) {
        const args = [];
        for (let arrayIndex = 0; arrayIndex < argc - 1; arrayIndex++) {
            args.push(inputArrays[arrayIndex]?.[itemIndex]);
        }
        mapped[itemIndex] = args;
    }
    return mapped;
}