Heres some array functions from Wrox Professional Javascript book

function Array_push(items)
{
  for(var x=0;x<arguments.length;x++)
    this[this.length]=arguments[x];
  return this.length;
}

if(!Array.prototype.pop)
  Array.prototype.pop=Array_pop;

function Array_pop()
{
  var old=this[this.length-1];
  delete this[this.length-1];
  this.length--;
  return old;
}

if(!Array.prototype.splice)
  Array.prototype.splice=Array_splice;

function Array_splice(start,deleteCount,items)
{
  var results = new Array();
  //copy items to delete and store in return array
  for(var x=0; x<deleteCount; x++)
    results[x] = this[x + start];
  //shift all remaining elements down
  for(x=start; x<this.length - deleteCount; x++)
    this[x] = this[x + deleteCount];
  //remove elements from the end
  this.length -= deleteCount;
  if(arguments.length>2)
  {
    //make room for the provided items to be inserted
    for(x=this.length-1; x>= start; x--)
      this[x + deleteCount] = this[x];
    //insert the provided items
    for(x=0; x<deleteCount; x++)
      this[x + start] = arguments[x + 2];
  }
  return results;
}

if(!Array.prototype.shift)
  Array.prototype.shift=Array_shift;

function Array_shift()
{
  var old=this[0];
  for(var x=0;x<this.length-1;x++)
    this[x]=this[x+1];
  delete this[this.length-1];
  this.length--;
  return old;
}

if(!Array.prototype.unshift||Array(6,6,6,6).unshift(4)!=5)
	Array.prototype.unshift=Array_unshift;

function Array_unshift(items)
{
  //move items up the chain
  for(var x=this.length-1;x>=0;x--)
    this[x+arguments.length]=this[x];
  for(x=0;x<arguments.length;x++)
    this[x]=arguments[x];

  return this.length;
}

-----Original Message-----
From: Greg Griffiths [mailto:greg.griffiths@g...]
Sent: 30 April 2002 20:21
To: javascript
Subject: [javascript] Arrays


Dear All,
	I'm trying to add data to an array in Javascript using code like :

	var a = new Array(1,2,3,4)

	if (needExtra==true)
	{
		a.concat(5,6);
	}

but it fails to work, I can't use the Push/Pop oir the Shift/Unshift as 
they only work in NN any ideas ?



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