fib() function and export it as default. The function calculates positive Fibonacci numbers. It takes an ordinal number (of a Fibonacci number) on input.
f(0) = 0 f(1) = 1 f(n) = f(n-1) + f(n-2)
fib(3); // 2 fib(5); // 5 fib(10); // 55
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