JavaScript · Junior · Question 22 of 75

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

✓Correct answer: [2, 4, 6]
2undefined
312

Explanation

map creates a new array from the callback's results without changing the original. Similar non-mutating methods: filter (selection), reduce (folding into one value), find, some, every.

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

Explanation

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

Explanation

Further reading

Test yourself

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