Javascript Join() Function

The join() function of array object will joins/adds all elements of an array into a string. Resulting string used to separate one element of an array from other element of array. Use it for example to join all elements into one string.

Syntax

str = arr.join([separator = ','])

Javascript Join() Function Example1

<html>
<head>
<script type="text/javascript">
// Create an array.
var arr = ['Jan', 'Fab', 'Mar', 'April'];
document.write(arr.join() + "<br/>");
document.write(arr.join(', ') + "<br/>");
document.write(arr.join(' / ') + "<br/>");
</script>
</head>
<body>
</body>
</html>

This will produce following result

Jan,Fab,Mar,April
Jan, Fab, Mar, April
Jan / Fab / Mar / April

Javascript Join() Function Example2

<html>
<head>
<script type="text/javascript">
// Create an array.
var arr = [1,2,3,4,5,6,7,8,9];

document.write(arr.join() + "<br/>");
document.write(arr.join('-') + "<br/>");
</script>
</head>
<body>
</body>
</html>

This will produce following result