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#244 repeat-string · par 4

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    No. 244 · Hard · template literal types

    Repeat

    Implement `Repeat<S, N>` so it concatenates the string `S` exactly `N` times. Repeating zero times gives the empty string.

    Puzzle

    repeat-string.ts
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    Checks

    4
    • Repeat<'ab', 3>—
      → 'ababab'
    • Repeat<'x', 0>—
      → ''
    • Repeat<'x', 1>—
      → 'x'
    • Repeat<'-', 5>—
      → '-----'

    How a check is judged Exact type equality, not assignability — an intersection is not the same as the flattened object.

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