JS action for cloning object and send a filter param altogether

readme.md

Clone a javascript object and iterate through keys and values with a replacer method.

var obj = {name: 'John', surname: 'Appleseed', job: {title: 'Web Developer', company: 'Apple Inc'}};
function replacer(key, value) {
    if (key === 'name') { return value.toLowerCase(); }
}

with cloneObj.js

var copy = clone(obj, replacer);

###update### For built-in scheme use JSON.stringify(obj, replacer) instead cloneObj.js

var copy = JSON.stringify(obj, replacer);
copy = JSON.parse(copy);

cloneObj.js

function clone(origin, filter) {
    'use strict';
    var obj, p;

    function isTypeOf(obj) {
        if (obj === undefined) { return undefined; }
        var obType = String(obj.constructor).match(/function\s+(\w+)/);
        return obType ? obType[1] : 'undefined';
        //return obType ? (obType[1] === type) : false;
    }

    switch (isTypeOf(origin)) {
    case 'Object':
        obj = {};
        for (p in origin) {
            if (origin.hasOwnProperty(p)) {
                obj[p] = clone(origin[p], filter);
                if (filter) { obj[p] = clone(filter(p, obj[p]) || obj[p], filter); }
            }
        }
        break;
    case 'Array':
        obj = [];
        for (p = 0; p < origin.length; p += 1) {
            obj[p] = clone(origin[p], filter);
        }
        break;
    default:
        obj = origin;
    }

    return obj;
}