Javascript Array each(callback)

Array.prototype.each = function(callback){
  for(var i = 0; i < this.length; i++){
    callback(this[i]);//from  www .ja va  2  s.c om
  }
}

Array.prototype.each = function(callback) {
  if (callback == void 0) return;
  for (var i=0, len=this.length; i<len; i++) {
    callback( this[i] );// w w  w .j a v  a2 s  .co  m
  }
}

Array.prototype.each = function(callback){
 if(!callback) return;
 for(var i = 0; i < this.length; i++){
  callback(this[i]);//w w w .  j a v  a 2 s  . c o m
 }
}

Array.prototype.each = function(callback)
{
    for(var i = this.length; -- i >= 0 ;)
    {/*from   ww  w  .j  av  a 2 s.  c  o  m*/
        if(false === callback(i,this[i]))
        {
            return;
        }
    }
}

Array.prototype.each = function(callback) {
  for(var i = 0; i < this.length; i++) {
    callback(this[i]);/*from  w  ww  .j  a  v  a2  s  . c om*/
  }
}

Array.prototype.each = function(callback) {
 if(is_undefined(callback)) {
  throw new SyntaxError("Array.each(callback): callback is undefined");
 }

 for (var i = 0; i < this.length; i++) {
  var args = [this[i], i];
  callback.apply(this, args);/*from   w  ww .j a  v a2  s  .  c om*/
 }
};

Array.prototype.each = function(callback) {
  for(var i = 0, l = this.length; i < l; i++) {
    callback(i, this[i]);/*w  w w . java2s.c  om*/
  }
  return this;
}