Clone JavaScript objects and Arrays

ObjectCloner.js

/**
 * Object and Array cloning system
 * ===============================
 * This basically deep clones an object and/or an array depending on its value and type.
 */

// clone an array
function arrayClone(source) {
    let target = [];
    source.forEach((val, idx) => {
        if (typeof(val) === "object") {
            if (Array.isArray(val)) {
                target.push(arrayClone(val));
            } else {
                target.push(objectClone(val));
            }
        } else {
            target.push(val);
        }
    });
    return target;
}

// clone an object
function objectClone(source) {
    let target = {};
    Object.keys(source).forEach((idx) => {
        if (typeof(source[idx]) === "object") {
            if (Array.isArray(source[idx])) {
               target[idx] = arrayClone(source[idx]);
            } else {
                target[idx] = objectClone(source[idx]);
            }
        } else {
            target[idx] = source[idx];
        }
    });
    return target;
}

/* Proof of Concept */

// a simple object, nothing weird about it
const source = [
    { a: 1, b: 2},
    { c: 3, d: { e: [ 4, 5, { x: 1, y: [ 2, 3, 4, [ 5, 6, { z: 4} ] ] } ] } }
]

// let's clone it...
let target = arrayClone(source);

// let's tweak a little bit this target
target[0].a = 0;
target[1].d.e[0] = 0;
target[1].d.e[2].x = 0;
target[1].d.e[2].y[3][2].z = 0;

// and let's see what we get from both!
console.log(`source: ${JSON.stringify(source)}`); // source: [{"a":1,"b":2},{"c":3,"d":{"e":[4,5,{"x":1,"y":[2,3,4,[5,6,{"z":4}]]}]}}]
console.log(`target: ${JSON.stringify(target)}`); // target: [{"a":0,"b":2},{"c":3,"d":{"e":[0,5,{"x":0,"y":[2,3,4,[5,6,{"z":0}]]}]}}]