extend

extend.js

function extend() {
    var target = arguments[0] || {};
    var length = arguments.length;
    var prop;

    for (var i = 1; i < length; i++) {
        if (typeof arguments[i] === 'object') {
            for (prop in arguments[i]) {
                target[prop] = arguments[i][prop];
            }
        }
    }

    return target;
}