How to use JavaScript array foreach

In this article, I am going to explain use of array foreach() in JavaScript.
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The array foreach method of JavaScript

The JavaScript foreach method  executes a user-defined function for each element of an array.

Syntax of array foreach element

array.foreach(callback[, thisArgs);


Parameters in array foreach  method:

  • arrary

    Array required an array object.
     

  • callback

    Callback function accepts up to three arguments, and callback function is used to test  for each element
     

  • thisArgs

    ThisArgs is used as this when executing callbacks.

Return value in foreach method

Foreach  method returned a newly created array.

Exception in foreach  method

If callback argument is not a function object, A TypeError exception is fire.

There are the following callback function parameter:
 

Parameter Value
value Array element value.
index Numeric  index of the array element.

Example of foreach method

<head>

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <script type="text/javascript">

    var numbers = [10, 10, 10];

 

    // Call the addNumber callback function for each array element.

    var sum = 0;

    numbers.forEach(

    function addNumber(value) { sum += value; }

);

 

    document.write(sum);

 

</script>

    <asp:Button ID="Button1" runat="server" Text="Button" />

    </form>

</body>


Output:

30


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