ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
Array.shift( ) Method
Flash 5
remove the first element of an array
array.shift()
Returns
The value of the first element of array, which is also deleted.
Description
The shift( ) method deletes the first element of an array and then moves all the remaining elements of the array up one position. The affected array's length is reduced by 1. Note that shift( ) differs from the pop( ) method, which deletes the last element of an array.