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1function fibonacci(n) {
2 // Calculate fibonacci sequence
3 if (n <= 1) return n;
4 let a = 0, b = 1;
5 for (let i = 2; i <= n; i++) {
6 const temp = a + b;
7 a = b;
8 b = temp;
9 }
10 return b;
11}
12
13console.log(fibonacci(10)); // 55