JavaScript · Junior · Question 23 of 75

What does `[1, 2, 3].forEach(x => x * 2)` return?

✓Correct answer: undefined
2[2, 4, 6]
3[1, 2, 3]

Explanation

forEach is for side effects and always returns undefined. Use map to get a new array. Another difference: you can't break out of forEach - use for...of, some or find for that.

What does `[1, 2, 3].forEach(x => x * 2)` return?

Explanation

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What does [1, 2, 3].forEach(x => x * 2) return?

Explanation

Further reading

Test yourself

What does `[1, 2, 3].forEach(x => x * 2)` return?