Code snippet - Array.splice according to ECMA

I've really missed the proper Array.splice in SSJS. To avoid writing a loop for every time I want to do a "splice operation", I've made a function that should work according to spec.

// $splice -> Array.splice according to ECMA standards
function $splice( array, startIndex, numItems ){
 try {
  var endIndex = startIndex + numItems;
  var itemsBeforeSplice = [], splicedItems = [], itemsAfterSplice = [];
  for( var i = 0; i < array.length; i++ ){
   if( i < startIndex ){ itemsBeforeSplice.push( array[i] ); }
   if( i >= startIndex && i < endIndex ){ splicedItems.push( array[i] ); }
   if( i >= endIndex ){ itemsAfterSplice.push( array[i] ); }      
  }
  
  // Insert all arguments/parameters after numItems
  for( i = 3; i < arguments.length; i ++ ){   
   itemsBeforeSplice.push( arguments[ ''+i ] );   
  }
  
  // Combine before/after arrays
  var remainingItems = itemsBeforeSplice.concat( itemsAfterSplice );
  
  // Rewrite array. Arrays can't be overwritten directly in SSJS
  for( i = 0, len=Math.max( array.length, remainingItems.length ); i < len; i++ ){
   if( remainingItems.length > i ){
    array[i] = remainingItems[i];
   } else {
    array.pop();
   }
  }
  
  return splicedItems;
 } catch(e){ /*Debug.logException( e );*/ }
}

Note! If you want to do a splice on a scoped field that's an array, you first have to copy it, or your script might crash. E.g.

viewScope.put( 'someArray', [1,2,3,4] ); 
...
var array = viewScope.someArray.concat(); // concat copies the array
$splice( array, 1, 2, 12, 22 ); // modifies the array, returns the removed items [2,3]
viewScope.put( 'someArray', array );// viewScope.someArray -> [1,12,22,4]

I really hope IBM fixes the SSJS API/makes it follow ECMA-262 Edition 3 (or newer editions), but only time will tell.