HTML and CSS Reference
In-Depth Information
The
pop()
Method.
The
pop()
method deletes the last element of an array and
returns the value popped off.
FORMAT
var return_value=Arrayname.pop();
EXAMPLE
var popped = myArray.pop();
EXAMPLE
9.11
<html>
<head><title>Array pop() method</title></head>
<body>
<script type="text/javascript">
1
var names=new Array("Tom", "Dan", "Liz", "Jody");
2
document.write("<b>Original array: "+
names
+"<br />");
3
var newstring=names.pop();
//
Pop off last element of array
4
document.write("Element popped: "+
newstring
);
5
document.write("<br />New array: "+
names
+ "</b>");
</script>
</body>
</html>
EXPLANATION
1
The
Array()
constructor creates a new array called
names
and initializes the array
with four values:
“Tom”
,
“Dan”
,
“Liz”
, and
“Jody”
.
2
The contents of the array called
names
is displayed.
3
The last element of the array is removed. The value removed is returned and as-
signed to the variable called
newstring
.
4
The popped value is displayed.
5
The shortened array is displayed (see Figure 9.14).
Figure 9.14
The Array
pop()
method.
The
push()
Method.
The
push()
method adds new elements onto the end of an array,
thereby increasing the length of the array. JavaScript allocates new memory as needed.
