easy Arrays & Math
Plus One
`digits` represents a non-negative integer, one digit per element (most significant first). Add one to it and return the resulting digits. Example: [1, 2, 3] → [1, 2, 4]; [9, 9] → [1, 0, 0].
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`digits` represents a non-negative integer, one digit per element (most significant first). Add one to it and return the resulting digits. Example: [1, 2, 3] → [1, 2, 4]; [9, 9] → [1, 0, 0].