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JavaScript Array forEach() Method

JavaScript array forEach() method is used to call the function once for each element in the array. Basically, this can be done by using for, while or do-while loops.

Syntax:

array.forEach( callback, thisObject )

Parameter Values

Parameter

Description

function(currentValue, index, arr)

It required to be run a function for each element in the array.
Function arguments:

Argument	Description
currentValue	It Required the current value of the element
index	It is used for the array index of the current element and it is Optional
arr	It is Optional and is used for the array object the current element belongs to

thisValue

It is Optional and is used for a value passed to the function to be used as its "this" value. The value "undefined" will be passed as its "this" value, if this parameter is empty.

Browser Support

Method	Chrome	Edge	Firefox	Safari	Opera
forEach()	Yes	9.0	1.5	Yes	Yes

Here is an example of JavaScript array forEach() Method:

<!DOCTYPE html>
<html>
<body>
<p id="arrayforeach"></p>
<script>
var countNum = ["Ram", "Shyam", "Geeta"];
countNum.forEach(myFunction);
function myFunction(item, index) {
  document.getElementById("arrayforeach").innerHTML += index + ":" + item + "<br>"; 
}
</script>
</body>
</html>

Output:

Example 2:

<!DOCTYPE html>
<html>
<body>
<script>
var arr = ['HTML', 'CSS', 'BOOTSTRAP'];
arr.forEach(function(fetch) {
  document.writeln(fetch);
});
</script>
</body>
</html>

Output:

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