How to use JavaScript Array.prototype.forEach() - forEach Explained with Examples

The ‘forEach’ array method is used to iterate through each item in an array. The method is called on the array Object and is passed a function that is called on each item in the array.

var arr = [1, 2, 3, 4, 5];

arr.forEach(number => console.log(number * 2));

// 2
// 4
// 6
// 8
// 10

The callback function can also take a second parameter of an index in case you need to reference the index of the current item in the array.

var arr = [1, 2, 3, 4, 5];

arr.forEach((number, i) => console.log(`${number} is at index ${i}`));

// '1 is at index 0'
// '2 is at index 1'
// '3 is at index 2'
// '4 is at index 3'
// '5 is at index 4'
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