Merge pull request #370 from cats256/patch-2

Update fibonacci-solution.js

Author: 01zulfi

10_fibonacci/solution/fibonacci-solution.js

@@ -1,10 +1,17 @@
 const fibonacci = function(count) {
-	if (count < 0) return "OOPS"
-	const fibPart = [0, 1];
-	for (let index = 1; index < count; index++) {
-		fibPart.push(fibPart[index] + fibPart[index -1]);
-	}
-	return fibPart[count];
+    if (count < 0) return "OOPS";
+    if (count === 0) return 0;
+
+    let firstPrev = 1;
+    let secondPrev = 0;
+    
+    for (let i = 2; i <= count; i++) {
+        let current = firstPrev + secondPrev;
+        secondPrev = firstPrev;
+        firstPrev = current;
+    }
+
+    return firstPrev;
 };
 
 module.exports = fibonacci;