JavaScript Array join() Method

Difficulty Level : Medium
Last Updated : 23 Jun, 2020

Below is the example of the Array join() method.

Example:

<script>
   function func() {
      var a = [ 1, 2, 3, 4, 5, 6 ];
      document.write(a.join('|'));
   }
   func();
< /script>
Output:
```
1|2|3|4|5|6
```

The arr.join() method is used to join the elements of an array into a string. The elements of the string will be separated by a specified separator and its default value is a comma(, ).

Syntax:

array.join(separator)

Parameters: This method accept single parameter as mentioned above and described below:

separator: It is Optional i.e, it can be either used as parameter or not.Its default value is comma(, ).
Return Value: It returns the String which contain the collection of array’s elements.

Below example illustrate the Array join() method in JavaScript:
- Example 1: In this example the function join() joins together the elements of the array into a string using ‘|’.
```
var a = [1, 2, 3, 4, 5, 6];
print(a.join('|'));
```
  Output:
```
1|2|3|4|5|6
```
- Example 2: In this example the function join() joins together the elements of the array into a string using ‘, ‘ since it is the default value.
```
var a = [1, 2, 3, 4, 5, 6];
print(a.join()); 
```
  Output:
```
1, 2, 3, 4, 5, 6
```
- Example 3: In this example the function join() joins together the elements of the array into a string using ‘ ‘ (empty string).
```
var a = [1, 2, 3, 4, 5, 6];
print(a.join(''));
```
  Output:
```
123456
```
Code for the above method is provided below:
Program 1:

<script>
   function func() {
      var a = [ 1, 2, 3, 4, 5, 6 ];
      document.write(a.join());
   }

   func();
</script>
Output:
```
1, 2, 3, 4, 5, 6
```
Program 2:

<script>
   function func() {
      var a = [ 1, 2, 3, 4, 5, 6 ];
      document.write(a.join(''));
   }
   func();
</script>
Output:
```
123456
```
Supported Browsers: The browsers supported by JavaScript Array join() method are listed below:
- Google Chrome 1.0
- Microsoft Edge 5.1
- Mozilla Firefox 1.0
- Safari
- Opera
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