Merge pull request 'feat(challenge-4): completed challenge' (#4) from feature/challenge-4 into develop

Reviewed-on: #4

04-fibonacci/index.js

@@ -1,4 +1,16 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
+  if (!value) return 0;
-}
+
+  let n1 = 0,
+    n2 = 1,
+    nextTerm;
+
+  for (let i = 1; i <= value; i++) {
+    nextTerm = n1 + n2;
+    n1 = n2;
+    n2 = nextTerm;
+  }
+
+  return n1;
+}