[2단계 - 웹 기반 로또 게임] 초코(강다빈) 미션 제출합니다.

src/util/validation/PurchaseAmountValidator.js

@@ -7,12 +7,16 @@ class PurchaseAmountValidator {
 
   static validate(purchaseAmount) {
     this.validateIsNumber(purchaseAmount);
-    const numberInput = parseInt(purchaseAmount, 10);
+    const numberInput = this.convertToNumber(purchaseAmount);
     this.validateIsInteger(numberInput);
     this.validateIsAtLeast(numberInput, OPTIONS.LOTTO.price);
     return numberInput;
   }
 
+  static convertToNumber(purchaseAmount) {
+    return parseInt(purchaseAmount, 10);
+  }
+
   static validateIsNumber(value) {
     if (!/^\d+$/.test(value)) {
       throw new Error(`${ERROR_MESSAGES.prefix}${ERROR_MESSAGES.isNotNumber(this.name)}`);