JavaScript forEach method not work with Arrow Function

Question

const array3 = [5, 10, 15, 20, 25, 30, 35, 40];
const function5 = (index, element) => {return index + ": " + element};
console.log(array3.forEach(function5));

Why this code not work, what I do wrong?

Answer 1

You need to use .map() as .forEach() will return you undefined always, and the result you expect can be obtained by using map() function:

const array3 = [5, 10, 15, 20, 25, 30, 35, 40];
const function5 = (index, element) => {return index + ": " + element};
console.log(array3.map(function5));