asvny

  function flatten(a) {
    return Array.isArray(a) ? [].concat.apply([], a.map(flatten)) : [a];
  }

asvny

async(function*() {
    console.log('start');
    yield asyncFunction();
    var value = yield asyncFunction();
    console.log('value', value);
});

function asyncFunction() {
    return new Promise((resolve, reject) => {
        setTimeout(() => {

asvny

if (!Object.prototype.assign) {  
    Object.prototype.assign = function() {
        var args = [].slice.call(arguments),
            target = args.shift();

        return args.reduce(function(base, obj) {
            Object.keys(obj).forEach(function(prop) {
                if (obj.hasOwnProperty(prop)) {
                    base[prop] = obj[prop];
                }

asvny

var debounce = function(func, wait) {
 // we need to save these in the closure
 var timeout, args, context, timestamp;

 return function() {

  // save details of latest call
  context = this;
  args = [].slice.call(arguments, 0);
  timestamp = new Date();