Simple implementation for some Enumerable functions in JS

enumerable.js

Array.prototype.transform = function(fn){ //map
  let newList =  [], i = 0, len = this.length;
  for(i; i < len; i++){
    newList.push(fn(this[i]));
  }
  return newList;
}

Array.prototype.exclude  =  function(fn){ //filter
  let filteredList = [], i = 0, len = this.length;
  for(i; i < len; i++){
    if(fn(this[i])){
      filteredList.push(this[i]);
    };
  }
  return filteredList
}

Array.prototype.aggregate =  function(fn, init){ //reduce
  let total =  init,i = 0, len = this.length;
  for(i; i < len; i++){
    total =  fn(total,this[i])
  }
  return total
}

Array.prototype.iterate =  function(fn){ //forEach
  let i = 0, len = this.length;
  for(i; i < len; i++){
    fn(this[i]);
  }
}