myArray.reverse() in ECMAScript 262

Reverses the order of the elements in the array, and returns the array.

Arguments

(this method takes no arguments)

Return Type
Array

Description

The original array is modified, and also returned; a new array is not created.
var foo = [0,1,2,3,4];
foo[9]=9;
foo.reverse();
foo.toString()=="9,NULL,NULL,NULL,NULL,4,3,2,1,0";