ActionScript 3.0 :: Insert Item Into Array Without Replace?

Apr 8, 2011

so if my array is

ActionScript Code: var topScores:Array = new Array(1000,900,800,700,600,500,400,300,200,100)

I know that I can replace the item at position 5 by doing ActionScript Code: topScores[4]=550

but how do I just insert another array item without replacing so that position 5 becomes position 6 and position 5 is the new number?

more to the point, I then ideally want to lose the last postion so that the same number of items exists in the array

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