transportation on vacation: done

Author: nerdrun

transportation_on_vacation/main.js

@@ -0,0 +1,26 @@
+function rentalCarCost(d) {
+  return (d * 40) - (d >= 7 ? 50 : d >= 3 ? 20 : 0);
+}
+
+/// Readable and reusable codes.
+// function baseCost(days, rate) {
+//   return days * rate;
+// }
+
+// function discountRate(days) {
+//   if ( days >= 7 ) {
+//     return 50;
+//   }
+//   else if ( days >= 3 ) {
+//     return 20;
+//   }
+//   else {
+//     return 0;
+//   }
+// }
+
+// function rentalCarCost(days) {
+//   return baseCost(days, 40) - discountRate(days);
+// }
+
+module.exports = rentalCarCost;

transportation_on_vacation/main.test.js

@@ -0,0 +1,31 @@
+const rentalCarCost = require('./main');
+
+describe('every day 40$ cost adding up test', () => {
+  test('1 should return 40', () => {
+    expect(rentalCarCost(1)).toBe(40);
+  });
+  test('2 should return 80', () => {
+    expect(rentalCarCost(2)).toBe(80);
+  });
+});
+
+describe('rent a car more than 3 days, 20$ off test', () => {
+  test('3 should return 100', () => {
+    expect(rentalCarCost(3)).toBe(100);
+  });
+  test('4 should return 140', () => {
+    expect(rentalCarCost(4)).toBe(140);
+  });
+  test('5 should return 180', () => {
+    expect(rentalCarCost(5)).toBe(180);
+  });
+});
+
+describe('rent a car more than 7 days, 50$ off test', () => {
+  test('7 should return 230', () => {
+    expect(rentalCarCost(7)).toBe(230);
+  });
+  test('8 should return 270', () => {
+    expect(rentalCarCost(8)).toBe(270);
+  });
+});