refactor: funcao fibonacci

04-fibonacci/index.js

@@ -1,10 +1,18 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  if (value < 1) {
-    return 0
+  if (value < 1) { 
+    return 0;
   } else if (value <= 2) {
-    return 1
-  } else { 
-    return (fibonacci(value - 1) + fibonacci(value - 2))
-  }
+    return 1;
+  } else {
+  let previous = 0;
+  let next = 1;
+  let total;
+  for (let i = 2; i <= value; i++) {
+       total = next +  previous;
+       previous = next;
+       next = total;
+      }
+    return total;
+    }
   }