https://cursosdemagia.com.br/userfiles/modules/microweber/api/tools/objects.js

1mw.object = {
2    extend: function () {
3        var extended = {};
4        var deep = false;
5        var i = 0;
6        var l = arguments.length;
7
8        if ( Object.prototype.toString.call( arguments[0] ) === '[object Boolean]' ) {
9            deep = arguments[0];
10            i++;
11        }
12        var merge = function (obj) {
13            for ( var prop in obj ) {
14                if ( Object.prototype.hasOwnProperty.call( obj, prop ) ) {
15                    if ( deep && Object.prototype.toString.call(obj[prop]) === '[object Object]' ) {
16                        extended[prop] = mw.object.extend( true, extended[prop], obj[prop] );
17                    } else {
18                        extended[prop] = obj[prop];
19                    }
20                }
21            }
22        };
23        for ( ; i < l; i++ ) {
24            var obj = arguments[i];
25            merge(obj);
26        }
27        return extended;
28
29    }
30};