JavaScript Array – forEach()

JavaScript Array forEach()

JavaScript Array forEach() is used to execute a given function for each element in the Array.

In this tutorial, we shall learn the syntax and usage of forEach with Examples.

Syntax

The syntax of forEach() function is

arr.forEach(function callbackFun(currentValue[, index[, array]]) {
    //set of statements
}[, thisArg]);

where

Keyword/Variable/Parameter	Mandatory/Optional	Description
arr	Mandatory	The array containing elements.
callbackFun	Optional	Function which has to be applied for each element of array
currentValue	Mandatory	The current element’s value for which callback function is being applied.
index	Optional	Index of the current element.
array	Optional	Array, on which forEach is being applied.
thisArg	Optional	thisArg is provided to forEach. Used as this value in forEach.arr.forEach(callbackFun, thisArg);

Example

In the following example, we take an array, and iterate over the elements using forEach() method.

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Conclusion

In this JavaScript Tutorial, we have learnt to use Array.forEach() method to apply a function for each element of the array.