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⚡️ Speed up function fibonacci by 4,364% #1099

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⚡️ Speed up function fibonacci by 4,364% #1099

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16 changes: 13 additions & 3 deletions code_to_optimize_js/fibonacci.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,20 @@
* @returns {number} - The nth Fibonacci number
*/
function fibonacci(n) {
if (n <= 1) {
return n;
const cache = new Map();
function fib(x) {
if (x <= 1) {
return x;
}
const cached = cache.get(x);
if (cached !== undefined) {
return cached;
}
const result = fib(x - 1) + fib(x - 2);
cache.set(x, result);
return result;
}
return fibonacci(n - 1) + fibonacci(n - 2);
return fib(n);
}

/**
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