JavaScript Array forEach()
Example 1
Calls a function for each element in fruits:
const fruits = ["apple", "orange", "cherry"];
fruits.forEach(myFunction);
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Description
The forEach() method calls a function for each element in an array.
The forEach() method is not executed for empty elements.
Array Iteration Methods:
Syntax
array.forEach(function(currentValue, index, arr), thisValue)
Parameters
| function() | Required. A function to run for each array element. |
| currentValue | Required. The value of the current element. |
| index | Optional. The index of the current element. |
| arr | Optional. The array of the current element. |
| thisValue | Optional. Default undefined.A value passed to the function as its this value. |
Return Value
| undefined |
More Examples
Compute the sum:
let sum = 0;
const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction);
function myFunction(item) {
sum += item;
}
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Multiply each element:
const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction)
function
myFunction(item, index, arr) {
arr[index] = item * 10;
}
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Array Tutorials:
Browser Support
forEach() is an ECMAScript5 (ES5 2009) feature.
JavaScript 2009 is supported in all browsers since July 2013:
| Chrome 23 |
IE/Edge 11 |
Firefox 21 |
Safari 6 |
Opera 15 |
| Sep 2012 | Sep 2012 | Apr 2013 | Jul 2012 | Jul 2013 |
