Quby

String.prototype.format = function(){
  var words = this.split(' '),
      arg = arguments,
	  values = typeof arg[0]=='object'?arg[0]:arg,i;
  for(i in words){
    if(words[i][0] == '%')words[i] = values[words[i].slice(1)];
  }
  return words.join(' ');
}

Quby

last = (new Date).getTime();
str = '';
for(i=0;i<100000;i++){
  str += ' Number ' + i;
}
print((new Date).getTime() - last)

Quby

last = (new Date).getTime();
str = '';
for(i=0;i<100000;i++){
  str += 'Number %0'.format(i);
}
print((new Date).getTime() - last)

Quby

String.prototype.format = function(){
  var words = this.split(' '),
      arg = arguments,
	  values = typeof arg[0]=='object'?arg[0]:arg,i,str='';
  for(i in words){
    str += ' ' + (words[i][0] == '%'?values[words[i].slice(1)]:words[i])
  }
  return str;
}

Quby

last = (new Date).getTime();
str = '';
for(a=0,b=0,c=0,d=0,f=0;a<1000,b<1000,c<1000,d<1000,f<1000;a++,b++,c++,d++,f++){
  str += 'Number %0 %1 %2 %3 %4'.format(a,b,c,d,f);
}
print((new Date).getTime() - last)

last = (new Date).getTime();
str = '';
for(a=0,b=0,c=0,d=0,f=0;a<1000,b<1000,c<1000,d<1000,f<1000;a++,b++,c++,d++,f++){

Quby

//Blocking scope
let(valuse){}
for(let values){}

//Tuples
(val1,val2)

//List expressions,range,reduce,guard
[a*a | list->a]
[1,3..33]

Quby

function Sequence(init,n,iter){
  return {
    take:function(x){
      var list=init.slice(0);
      while(x>list.length){
        list.push(iter.apply(null,(n!=Infinity?list.slice(list.length-n):list).concat(list.length)));
      }
      return list
    },
    read:function(x){

Quby

Math.add = function(a,b){
  return a+b;
}

fib = Sequence([0,1],2,Math.add);

fib.take(20);
[0,1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181]

fib.read(15);

Quby

Math.mult = function(a,b){
  return a*b;
}

fact = Sequence([1],1,Math.mult)

fact.take(20)
[1,1,2,6,24,120,720,5040,40320,362880,3628800,39916800,479001600,6227020800,87178291200,1307674368000,20922789888000,355687428096000,6402373705728000,121645100408832000]

fact.read(15)

Quby

(function(_){
  _.zip = function(){
    var i,u,res=[],list;
    for(i=0;i<arguments[0].length;i++){
      list = [];
      for(u=0;u<arguments.length;u++){
	    list.push(arguments[u][i]);
	  }
	  res.push(list);
    }