Gozala

// Lack of tail call optimization in JS
var sum = function(x, y) {
  return y > 0 ? sum(x + 1, y - 1) :
         y < 0 ? sum(x - 1, y + 1) :
         x
}

sum(20, 100000) // => RangeError: Maximum call stack size exceeded

// Using workaround

michaelficarra

int random(int min, int max) {
    if(min == max) return min;
    if(min > max) {
        int tmp = max;
        max = min;
        min = tmp;
    }

    int range = max - min + 1;
    int randMax = RAND_MAX - ((RAND_MAX - range + 1) % range);

michaelficarra

// compute factorial of 5
Y(function(self){
  return function(x){
    return x == 0 ? 1 : x * self(x - 1);
  };
})(5); // === 120

michaelficarra

require 'openssl'

def hmac key, message
  sha = OpenSSL::Digest::SHA256.new
  blocksize = 64 # SHA256 uses a 64 byte (512 bit) block size

  def xor str0, str1 # assuming strings are of equal length
    b0 = str0.bytes.to_a
    b1 = str1.bytes.to_a
    result = []

michaelficarra

var F = function(){};
F.prototype = klass.prototype;
var o = new F();
klass.apply(o,arguments)
return o;

michaelficarra

forkNode = ->
  args     = process.argv[1..]
  nodeArgs = []
  while (idx = args.indexOf '--nodejs') > -1
    nodeArgs = nodeArgs.concat args.splice(idx,2)[1].split(/\s+/)
  spawn process.execPath, nodeArgs.concat(args),
    cwd:        process.cwd()
    env:        process.env
    customFds:  [0, 1, 2]

michaelficarra

arrayEq = (a, b) ->
  if a is b
    # 0 isnt -0
    a isnt 0 or 1/a is 1/b
  else if a instanceof Array and b instanceof Array
    return no unless a.length is b.length
    return no for el, idx in a when not arrayEq el, b[idx]
    yes
  else
    # NaN is NaN

michaelficarra

__extends = function(parent, child) {
    var ctor = function(){};
    ctor.prototype = parent.prototype;
    child.prototype = new ctor;
    child.prototype.constructor = child;
    if(typeof parent.extended === 'function') parent.extended(child);
    child.__super__ = parent.prototype;
    return child;
};

michaelficarra

unless Function::bind?
  Function::bind = (scope, args...) ->
    target = this
    if typeof target isnt "function" then throw new TypeError
    bound = ->
      unless this intanceof bound
        return target.apply scope, [args..., arguments...]
      F = ->
      F.prototype = target.prototype
      self = new F