JavaScript Array forEach() Method
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JavaScript Array forEach() Method
The forEach() method executes a provided function once for each array element.
Note: This method does not alter the original array.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Multiply all element in an array by 10<p>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
var crossNumber = 10;
function multiply(num) {
document.write(num +" × " +crossNumber +" = " +num*crossNumber +"<br>");
}
myNumber.forEach(multiply);
</script>
</body>
</html>
Syntax
Array.forEach(function(value, index, arr), thisArg);
//or
Array.forEach(functionName);
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| function(value, index, arr) | Required | Function to test for each element in an array. Value - Specifies a value or element in an array. index - Specifies the index of a value or element in an array. arr - Specifies the whole array. |
| thisArg | Optional | Specifies a value against which each element in an array is tested. |
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Multiply all element in an array by 10<p>
<script>
var myNumber = [1, 2, 3, 4, 5, 6, 7];
function multiply(num, index, arr) {
document.write(num+" × "+this+" = "+num*this+"<br>");
}
myNumber.forEach(multiply, 10);
</script>
</body>
</html>
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