Array Length
In this chapter you will learn:
Array Length
The number of items in an array is stored in the length property.
<!DOCTYPE html><!--from j a va 2 s . c om-->
<html>
<head>
<script type="text/javascript">
//creates an array with three strings
var colors = ["A", "B", "C"];
//creates an empty array
var names = [];
document.writeln(colors.length); //3
document.writeln(names.length); //0
</script>
</head>
<body>
</body>
</html>
length is not read-only
By setting the length property, you can remove
or add items to the end of the array.
<!DOCTYPE html><!--from j a v a 2 s . c o m-->
<html>
<head>
<script type="text/javascript">
//creates an array with three strings
var colors = ["A", "B", "C"];
colors.length = 2;
document.writeln(colors[2]); //Undefined
//add a color (position 99)
colors[99] = "D";
document.writeln(colors.length); //100
</script>
</head>
<body>
</body>
</html>
Next chapter...
What you will learn in the next chapter:
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