How to use javascript join method

The javascript join method is used to put all elements in the array into a string. The syntax of this method is "arrayObject.join(separator)", and its parameter separator represents the separator to be used.

The operating environment of this article: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

JavaScript join() method

Definition and usage

The join() method is used to join all elements in the array Put in a string.

Elements are separated by the specified delimiter.

Syntax

arrayObject.join(separator)

Parameters

separator Optional. Specify the delimiter to use. If this parameter is omitted, a comma is used as the delimiter.

Return value

Returns a string. The string is generated by converting each element of the arrayObject to a string and then concatenating the strings, inserting the separator string between the two elements.

Example

Example 1

In this example, we will create an array and then put all its elements into a string:

<script type="text/javascript">
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
document.write(arr.join())
</script>

Output:

George,John,Thomas

Example 2

In this example, we will use the delimiter to separate the elements in the array:

<script type="text/javascript">
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
document.write(arr.join("."))
</script>

Output:

George.John.Thomas

[Recommended learning: js basic tutorial]

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