Array shift()
In this chapter you will learn:
shift():Array Queue Methods
JavaScript array can act as a queue. Queues restrict access in a first-in-first-out (FIFO) data structure. A queue adds items to the end of a list and retrieves items from the front of the list.
The array method for retrieving from a queue is called shift(). shift() removes the first item in the array and returns it decreases the length of the array by one.
<!DOCTYPE html><!-- ja va 2 s .c om-->
<html>
<head>
<script type="text/javascript">
var colors = new Array(); //create an array
var count = colors.push("A", "B"); //push two items
document.writeln(count); //2
count = colors.push("C"); //push another item on
document.writeln(count); //3
var item = colors.shift(); //get the first item
document.writeln(item); //"A"
document.writeln(colors.length); //2
</script>
</head>
<body>
</body>
</html>
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