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An answer for the exercise fibonacci
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| func fibonacci() func() int { | |
| a, b := -1, 1 | |
| return func() int { | |
| if a == -1 { | |
| a = 0 | |
| return a | |
| } | |
| a, b = b, a + b | |
| return a | |
| } | |
| } |
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