CodingBat fibonacciWord

fibonacciWord

The first two fibonacciWords are "b" and "a." The third fibonacciWord is "ab" which is the concatenation of the two previous fibonacciWords. Each successive fibonacciWord is the concatenation of the previous two. The fibonacciWords are "b", "a", "ab", "aba", "abaab", "abaababa", and so on.

fibonacciWord(0) → "b"
fibonacciWord(1) → "a"
fibonacciWord(2) → "ab"

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