Examples on JavaScript: array

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JavaScript: Concat Function

concat Function:
Joins two arrays and returns a new array.

Syntax:
concat(arrayName2,arrayName3, ...,arrayNameN);

Example in HEAD section:

<html>
<head>
<title>Concat Function</title>
<script language="javascript">
var s1="Oh "
var s2="what a beautiful "
var s3="morning"
var s4=s1.concat(s2,s3)
document.write(s4);
</script>
</head>
</html>

Example in BODY section:

<html>
<head>
<title>Concat Function</title>
</head>
<body>
<script language="javascript">
var s1="Oh "
var s2="what a beautiful "
var s3="morning"
var s4=s1.concat(s2,s3)
document.write(s4);
</script>
</body>
</html>

OUTPUT

Oh what a beautiful morning

JavaScript: unshift Function

unshift Function:
Adds one or more elements to the beginning of an array and returns the new length of the array.

Syntax:
arrayname.unshift(element1,element2.........elementn)

Example in HEAD section:

<html>
<head>
<title>unshift Function</title>
<script language="javascript">
var nushifted;
myArray = ["angel", "clown"];
document.writeln("myArray before: " + myArray + "<p>");
unshifted = myArray.unshift("mandarin", "surgeon");
document.writeln("myArray after: " + myArray + "<p>");
</script>
</head>
</html>

Example in BODY section:

<html>
<head>
<title>unshift Function</title>
</head>
<body>
<script language="javascript">
var nushifted;
myArray = ["angel", "clown"];
document.writeln("myArray before: " + myArray + "<p>");
unshifted = myArray.unshift("mandarin", "surgeon");
document.writeln("myArray after: " + myArray + "<p>");
</script>
</body>
</html>

OUTPUT

myArray before: angel,clown

myArray after: angel,clown,mandarin,surgeon

JavaScript: Shift Function

shift Function:
Removes the first element from an array and returns that element. This method changes the length of the array.

Syntax:
arrayname.shift()

Example in HEAD section:

<html>
<head>
<title>Shift Function</title>
<script language="javascript">
myArray = ["angel", "clown", "mandarin", "surgeon"];
document.writeln("myArray before: " + myArray + "<p>");
shifted = myArray.shift();
document.writeln("myArray after: " + myArray + "<p>");
document.writeln("Removed this element: " + shifted);
</script>
</head>
</html>

Example in BODY section:

<html>
<head>
<title>Shift Function</title>
</head>
<body>
<script language="javascript">
myArray = ["angel", "clown", "mandarin", "surgeon"];
document.writeln("myArray before: " + myArray + "<p>");
shifted = myArray.shift();
document.writeln("myArray after: " + myArray + "<p>");
document.writeln("Removed this element: " + shifted);
</script>
</body>
</html>

OUTPUT

myArray before: angel,clown,mandarin,surgeon

myArray after: clown,mandarin,surgeon

Removed this element: angel

Javascript: Create Array

Arrays:Arrays are Javascript object data capable of story sequence of values. These values are store index location with in array.
Array must be declare before it use.

Syntax:
1. arrayname = new Array(arraylength);
2. arrayname = new Array();

An array element index start with Zero (0) and end with arraylength-1

Example:

<html>
<head>
<title>Arrays</title>
</head>
<body>

&ltscript language="javascript">
var months=new Array("January","February","March","April","May","June","July","August","September","October","November","December");
var i=0;
for(i=0;i<12;i++)
{
document.write(months[ i ] + "&ltbr>");
}
</script>

</body>
</html>

OUTPUT

January
February
March
April
May
June
July
August
September
October
November
December

JavaScript: Concat Function

JavaScript: unshift Function

JavaScript: Shift Function

Javascript: Create Array

More Examples