feat(2019-01): calculate fuel from mass ratios

Author: developher-net

2019/day-01/part-1/fuel-calculator.js

@@ -0,0 +1,7 @@
+const calculateFuel = (mass) => {
+  return Math.floor(mass / 3) - 2
+}
+
+module.exports = {
+  calculateFuel
+}

2019/day-01/part-1/fuel-calculator.test.js

@@ -2,14 +2,15 @@
 const expect = require('chai').expect
 const { calculateFuel } = require('./fuel-calculator')
 
-describe('2019 Day 01', () => {
-  it('calculates the fuel amount for a specified mass', () => {
-    const inputs = [12, 14, 1969, 100756]
-    const outputs = [2, 2, 654, 33583]
+describe('--- 2019 Day 1: The Tyranny of the Rocket Equation ---', () => {
+  describe('Part 1', () => {
+    it('calculates the fuel amount for a specified mass', () => {
+      const inputs = [12, 14, 1969, 100756]
+      const outputs = [2, 2, 654, 33583]
 
-    inputs.forEach((input, idx) => {
-      console.log(input)
-      expect(calculateFuel(input)).equals(outputs[idx])
+      inputs.forEach((input, idx) => {
+        expect(calculateFuel(input)).equals(outputs[idx])
+      })
     })
   })
 })