NV

function count(x, i) {
  var i = i || 1;
  console.log(i);
  if (i < x) count(x, i+1);
}

count(5) // 1, 2, 3, 4, 5


function count_with_depth_limit (x, start) {

NV

/**
 * Example: 
 * 'hello {{username}}'.between('{{','}}') === 'username'
 */

String.prototype.between_regexp = function between(begin, end) {
  var regexp = new RegExp(begin + '(.+)' + end);
  return this.match(regexp)[1];
}

NV

function fib(n) {
  if (n==0) {
    return 0
  } else if (n==1) {
    return 1
  } else {
    return fib[n] = fib[n] || fib(n-2) + fib(n-1)
  }
}

NV

Function.prototype.callMany = function (context) {
  var result = [];
  for (var i=1; i<arguments.length; i++) {
    result.push( this.call(context, arguments[i]) );
  }
  return result;
}

function hi (name) {
  return 'Hi '+ name + '!';

NV

'wrath, greed, sloth, pride, lust, envy, and gluttony'.match(/greed.+/)
#<MatchData "greed, sloth, pride, lust, envy, and gluttony">

'wrath, greed, sloth, pride, lust, envy, and gluttony'.match(/greed.+?/)
#<MatchData "greed,">

NV

JS Preprocessor

NV

// ==UserScript==
// @name           ligatweet
// @namespace      http://leaverou.me/demos/ligatweet/
// @description    Script for tweet shortening using unicode ligatures and other compound symbols
// @include        htt*://twitter.com/*
// @author         Lea Verou (UserJS by Nikita Vasilyev)
// @version        1.0
// @license        Licensed under the MIT license http://www.opensource.org/licenses/mit-license.php
// ==/UserScript==

NV

function f(){/* comment */}

alert(f+'');


// Opera, IE, Chrome: function f(){/* comment */}
// Firefox, Safari: function f(){}
//
// Note: in Firefox: f+'' === f.toSource()

NV

/**
 * Example: 
 * 'hello {{username}}'.between('{{','}}') === 'username'
 */

String.prototype.between_regexp = function between(begin, end) {
  var regexp = new RegExp(begin + '(.+)' + end);
  return this.match(regexp)[1];
}

NV

// JS Events API sucks. addEventListener ugly. If I'll design this API from scratch, I've done this:

window.events // {}
window.events.load // []
window.events.load.length // 0

window.events.load.push(function(e){
  alert('window loaded')
})
window.events.load.length // 1