What does .join do in javascript?

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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:

   } 

   func(); 

 

Output:

1, 2, 3, 4, 5, 6

Program 2:

 

Output:

123456

Supported Browsers: The browsers supported by JavaScript Array join() method are listed below:

• Google Chrome 1.0 and above
• Microsoft Edge 12 and above
• Mozilla Firefox 1.0
• Safari 1 and above
• Opera 4 and above