[js][bonus-03_extract_class] Split DailyBonus in two explicit classes

Author: rgomezcasas

examples/js/js-bonus-03_extract_class/src/DailyBonusPointsCalculator.js

@@ -0,0 +1,7 @@
+export class NormalUserDailyBonusPointsCalculator {
+    POINTS_PER_DAY = 10;
+    
+    calculate(consecutiveDays) {
+        return consecutiveDays * this.POINTS_PER_DAY;
+    }
+}

examples/js/js-bonus-03_extract_class/src/NormalUserDailyBonusPointsCalculator.js

@@ -0,0 +1,15 @@
+export class PremiumUserDailyBonusPointsCalculator {
+    POINTS_PER_DAY   = 20;
+    WEEKS_MULTIPLIER = 1.5;
+    
+    calculate(consecutiveDays) {
+        const consecutiveWeeks = Math.floor(consecutiveDays / 7);
+        
+        let consecutiveWeeksMultiplier = 1;
+        if (consecutiveWeeks > 0) {
+            consecutiveWeeksMultiplier = Math.pow(this.WEEKS_MULTIPLIER, consecutiveWeeks);
+        }
+        
+        return consecutiveDays * this.POINTS_PER_DAY * consecutiveWeeksMultiplier;
+    }
+}

examples/js/js-bonus-03_extract_class/src/PremiumUserDailyBonusPointsCalculator.js

@@ -1,27 +1,28 @@
-import {DailyBonusPointsCalculator} from "../src/DailyBonusPointsCalculator";
+import {NormalUserDailyBonusPointsCalculator}  from "../src/NormalUserDailyBonusPointsCalculator";
+import {PremiumUserDailyBonusPointsCalculator} from "../src/PremiumUserDailyBonusPointsCalculator";
 
 describe('DailyBonusPointsCalculator should', () => {
     it('Calculate points for a normal user on its first day', () => {
-        const calculator = new DailyBonusPointsCalculator();
+        const calculator = new NormalUserDailyBonusPointsCalculator();
 
-        expect(calculator.calculateNormal(1)).toBe(10);
+        expect(calculator.calculate(1)).toBe(10);
     });
 
     it('Calculate points for a normal user on its second consecutive week', () => {
-        const calculator = new DailyBonusPointsCalculator();
+        const calculator = new NormalUserDailyBonusPointsCalculator();
 
-        expect(calculator.calculateNormal(14)).toBe(140);
+        expect(calculator.calculate(14)).toBe(140);
     });
 
     it('Calculate points for a premium user on its first day', () => {
-        const calculator = new DailyBonusPointsCalculator();
+        const calculator = new PremiumUserDailyBonusPointsCalculator();
 
-        expect(calculator.calculatePremium(1)).toBe(20);
+        expect(calculator.calculate(1)).toBe(20);
     });
 
     it('Calculate points for a premium user on its second consecutive week', () => {
-        const calculator = new DailyBonusPointsCalculator();
+        const calculator = new PremiumUserDailyBonusPointsCalculator();
 
-        expect(calculator.calculatePremium(14)).toBe(630);
+        expect(calculator.calculate(14)).toBe(630);
     });
 });