Passed all remaining tests in exercise 10

10_fibonacci/fibonacci.js

@@ -1,5 +1,18 @@
-const fibonacci = function() {
-
+const fibonacci = function(number) {
+    if (number == 0) {
+        return 0;
+    }
+    if (number < 0) {
+        return "OOPS";
+    }
+    let a = 1, b = 1;
+    let sum = a;
+    for (let i = 0;
+         i < number - 2;
+         i++, (i % 2 == 0) ? a = sum : b = sum) {
+        sum = a + b;
+    }
+    return sum;
 };
 
 // Do not edit below this line

10_fibonacci/fibonacci.spec.js

@@ -4,34 +4,40 @@ describe('fibonacci', () => {
   test('4th fibonacci number is 3', () => {
     expect(fibonacci(4)).toBe(3);
   });
-  test.skip('6th fibonacci number is 8', () => {
+  test('6th fibonacci number is 8', () => {
     expect(fibonacci(6)).toBe(8);
   });
-  test.skip('10th fibonacci number is 55', () => {
+  test('10th fibonacci number is 55', () => {
     expect(fibonacci(10)).toBe(55);
   });
-  test.skip('15th fibonacci number is 610', () => {
+  test('15th fibonacci number is 610', () => {
     expect(fibonacci(15)).toBe(610);
   });
-  test.skip('25th fibonacci number is 75025', () => {
+  test('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
-  test.skip('0th fibonacci number is 0', () => {
+  test('1st fibonacci number is 1', () => {
+    expect(fibonacci(1)).toBe(1);
+  });
+  test('2nd fibonacci number is 1', () => {
+    expect(fibonacci(2)).toBe(1);
+  });
+  test('0th fibonacci number is 0', () => {
     expect(fibonacci(0)).toBe(0);
   });
-  test.skip('doesn\'t accept negatives', () => {
+  test('doesn\'t accept negatives', () => {
     expect(fibonacci(-25)).toBe("OOPS");
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("0")).toBe(0);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("1")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("2")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("8")).toBe(21);
   });
 });