I have an array like var test:Array = new Array("a", "b", "c"); How can I write a method to get one element and make it be string each time when I call this method. i.e when I call the method, it should return only 'a' and next time return only 'b' and so on.
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2 Answers
You can use function shift of Array,here is a link about the function array shift
var test:Array = new Array("a", "b", "c");
var firstLetter:String = test.shift();//"a"
var secondLetter:String = test.shift();//"b"
var thirdLetter:String = test.shift();//"c"
Comments
@Pan's answer is correct, but I feel the need to flag the fact that shift() ignites an extremely slow process of re-indexing your entire array. It's not something you need to concern yourself with with small arrays like in your example, but for larger arrays there's a significant performance boost if you reverse() the array first and then use pop(). I'll create a performance comparison below.
Set up our test arrays:
var shiftCopy:Array = [];
var popCopy:Array = [];
for(var i:int = 0; i < 100000; i++)
{
var rand:Number = Math.random() * i;
shiftCopy.push('a' + rand);
popCopy.push('a' + rand);
}
Run the tests:
// Using shift.
var t:int = getTimer();
while(shiftCopy.length > 0) shiftCopy.shift();
trace(getTimer() - t);
// Using reverse and pop.
t = getTimer();
popCopy.reverse();
while(popCopy.length > 0) popCopy.pop();
trace(getTimer() - t);
My results:
shift: 1651ms
pop: 19ms
