Sets in code

A collection that holds each value at most once, answers "is it in here?" at once, and combines groups with union and intersection.

Depth 1 · Foundation

You can use a set to drop repeats, test membership quickly and find what two groups share or don't, and you know a set has no order or positions.

Depths of understanding

1
Foundation
You can use a set to drop repeats, test membership quickly and find what two groups share or don't, and you know a set has no order or positions.
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DictionariesA set is a dictionary's keys without the values, fast for the same hash-table reason.

What's still between you and Sets in code, depth 1, in the order you can learn it.

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