JavaScript forEach() function with an array used to execute a function on each item in an array. This method calls a function for each element in an array if the array is not empty.
array.forEach(function(currentValue, index, arr), thisValue)Example Array forEach JavaScript
Simple HTML example code.
<!DOCTYPE html>
<html>
<head>
<script>
const array1 = ['a', 'b', 'c'];
array1.forEach(element => console.log(element));
</script>
</head>
<body>
</body>
</html>
Output:
More example
Get the sum of a given number
<script>
let sum = 0;
const numbers = [10, 20, 30];
numbers.forEach(myFunction);
function myFunction(item) {
sum += item;
}
console.log(sum)
</script>Output: 60
Multiply each element of the array by 10:
<script>
let sum = 0;
const numbers = [10, 20, 30];
numbers.forEach(myFunction);
function myFunction(item, index, arr) {
arr[index] = item * 10;
}
console.log(numbers)
</script>Output: Array(3) [ 100, 200, 300 ]
Do comment if you have any doubts or suggestions on this JS Array topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version