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JavaScript Array join() Method

  • Difficulty Level : Medium
  • Last Updated : 23 Jun, 2020
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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

    Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




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