func_get_args.js

/**
 * Return all the arguments of a specific function.
 * @param func
 * @returns {Array|{index: number, input: string}}
 */
function func_get_args(func) {
    var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
    var ARGUMENT_NAMES = /([^\s,]+)/g;
    var fnStr = func.toString().replace(STRIP_COMMENTS, '');
    var result = fnStr.slice(fnStr.indexOf('(') + 1, fnStr.indexOf(')')).match(ARGUMENT_NAMES);
    if (result === null)
        result = [];
    return result;
}