Function extend

lib/Command.js:427–441

(object, donor)

});

function extend(object, donor) {
    var key, keys = Object.keys(donor),
    i = keys.length;

    if (object === undefined) {
        object = {};
    }

    while (i--) {
        key = keys[i];
        object[key] = donor[key];
    }

    return object;
}

function runtimeCommand(name, func) {
    Command.prototype[name] = (function () {