CodingBat countUpDown

countUpDown

When a is less than or equal to b, return a string that concatenates the digits from a up to b, then from b down to a. When a is greater than b return a string that concatenates a and b.

countUpDown(1, 5) → "1234554321"
countUpDown(5, 1) → "51"
countUpDown(3, 5) → "345543"

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Difficulty: 250 Post-solution available

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