Unique, ascending in JavaScript

JavaScript interview exercise on Arrays, difficulty 1 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.

Write uniqueSorted(nums) that returns the distinct numbers in ascending numeric order. Don't mutate the input.

Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.

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