How to use JavaScript array foreach
In this article, I am going to explain use of array foreach() in JavaScript.
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);
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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>
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Output:
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