add solution for module 1: js basics

module-1/classification.js

@@ -21,7 +21,7 @@ function grade(score) {
      * Also take into consideration the documentation of the function!
      */
     // PLACE YOUR CODE BETWEEN THIS...
-
+    gradeOfStudent = (score >= 0 && score <= 100) ? Math.max(Math.min(Math.floor(score / 10) - 4, 5), 1) : 0;
     // ...AND THIS COMMENT LINE!
     return gradeOfStudent;
 }

module-1/euclidean.js

@@ -16,8 +16,20 @@ function euclidean(a, b) {
      * Also take into consideration the documentation of the function!
      */
     // PLACE YOUR CODE BETWEEN THIS...
-
-
+    if (a > 0 && b > 0 && typeof (a) === 'number' && typeof (b) === 'number') {
+        while (a != b) {
+            if (a > b) {
+                a -= b;
+            }
+            else {
+                b -= a;
+            }
+        }
+        gcd = a;
+    }
+    else {
+        gcd = 0;
+    }
     // ...AND THIS COMMENT LINE!
     return gcd;
 }

module-1/fibonacci.js

@@ -15,7 +15,23 @@ function fibonacci(n) {
      * Also take into consideration the documentation of the function!
      */
     // PLACE YOUR CODE BETWEEN THIS...
-
+    if (n >= 0) {
+        if (n < 2 && typeof (n) === 'number') {
+            nThFibonacci = n;
+        } else {
+            let f0 = 0;
+            let f1 = 1;
+            for (let i = 2; i <= n; ++i) {
+                const sum = f0 + f1;
+                f0 = f1;
+                f1 = sum;
+            }
+            nThFibonacci = f1;
+        }
+    }
+    else {
+        nThFibonacci = 0;
+    }
     // ...AND THIS COMMENT LINE!
     return nThFibonacci;
 }