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06_leapYears/leapYears.js

@@ -1,6 +1,33 @@
-const leapYears = function() {
+const leapYears = function(year) {
-
+    return year % 4 == 0 && (year % 400 == 0 || year % 100 !== 0);
 };
 
+
+
 // Do not edit below this line
 module.exports = leapYears;
+
+/*
+
+const divOneHundred = year / 100;
+    const divFourHundred = year / 400;
+    if (year % 100 == 0 && year % 400 == 0) {
+        return false;
+    } else if (year % 4 == 0 || Math.round(divFourHundred) == divFourHundred) {
+        return true;
+    } else {
+        return false;
+    }
+
+
+
+
+console.log(1600 % 400);
+
+1800 % 400 = 200 (remainder)
+1600 % 400 = 0
+
+1600 / 400 = 4 = num//true
+1900 / 400 = 4.75 = num//false
+Math.round(num) == num
+*/

06_leapYears/leapYears.spec.js

@@ -4,19 +4,19 @@ describe('leapYears', () => {
   test('works with non century years', () => {
     expect(leapYears(1996)).toBe(true);
   });
-  test.skip('works with non century years', () => {
+  test('works with non century years', () => {
     expect(leapYears(1997)).toBe(false);
   });
-  test.skip('works with ridiculously futuristic non century years', () => {
+  test('works with ridiculously futuristic non century years', () => {
     expect(leapYears(34992)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1900)).toBe(false);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1600)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(700)).toBe(false);
   });
 });