What is the difference between Array#map and Array#each?

beginner

Re-explain

each: Iterates through elements, returns original array, used for side effects
map: Transforms elements, returns new array with transformed values

numbers = [1, 2, 3]
numbers.each { |n| n * 2 }  # Returns [1, 2, 3]
numbers.map { |n| n * 2 }   # Returns [2, 4, 6]

Rewriting in plainer words…

This answer doesn't lend itself to a diagram - it reads best . No credits were charged.

Why there's no diagram: “”

The interactive diagram is below the answer - jump to diagram ↓ · Below it, the related concept . Jump to it ↓

The diagram below the answer is the concept . Jump to it ↓

Tailored explanation · switch back to · ·

What should the new diagram focus on?

How well did you know this?

AI:

Saved in this browser - sign in to keep your review list.

How should your speech become text?

Listening… your words appear above as you speak - tap Stop when you're done.

Recording · cr - tap Stop & transcribe when you're done.

Transcribing with AI…

Voice:

Keep going - a few more words and AI can grade it.

Interview lens

Likely follow-ups, what you can say, and the weak answers to avoid.

Want a quick review of the fundamentals? See the Ruby cheatsheet.

Pro · $10/mo

Full answers, code samples, and AI explanations that go simpler or deeper. Cancel anytime.