JavaScript Array join() Method

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:

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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