Pull up "times" operation

src/money/index.spec.ts

@@ -1,4 +1,4 @@
-import Money from '../money';
+import Money, { Franc } from '../money';
 
 describe('Money', () => {
   describe('equality', () => {
@@ -9,6 +9,10 @@ describe('Money', () => {
       expect(Money.dollar(5).equals(Money.dollar(6))).toBe(false);
       expect(Money.franc(5).equals(Money.dollar(5))).toBe(false);
     });
+
+    it('should return true if comparing two different classes with the same amount and currency', () => {
+      expect(new Money(5, 'CHF').equals(new Franc(5, 'CHF'))).toBe(true);
+    });
   });
 
   describe('currency', () => {

src/money/index.ts

@@ -1,4 +1,4 @@
-abstract class Money {
+class Money {
   private _amount: number;
   private _currency: string;
 
@@ -13,7 +13,7 @@ abstract class Money {
 
   equals(obj: Object): boolean {
     const money: Money = obj as Money;
-    return this.amount == money.amount && obj.constructor.name == this.constructor.name;
+    return this.amount == money.amount && money.currency == this.currency;
   }
 
   static dollar(amount: number): Money {
@@ -24,23 +24,17 @@ abstract class Money {
     return new Franc(amount, 'CHF');
   }
 
-  abstract times(multiplier: number): Money;
+  times(multiplier: number): Money {
+    return new Money(this.amount * multiplier, this.currency);
+  }
 
   get currency(): string {
     return this._currency;
   }
 }
 
-export class Dollar extends Money {
-  times(multiplier: number): Money {
-    return Money.dollar(this.amount * multiplier);
-  }
-}
+export class Dollar extends Money {}
 
-export class Franc extends Money {
-  times(multiplier: number): Money {
-    return Money.franc(this.amount * multiplier);
-  }
-}
+export class Franc extends Money {}
 
 export default Money;