From bb354587d9294e540cc658720b0317d4226e0a12 Mon Sep 17 00:00:00 2001
From: Jungwoo LEE <jungwoo3490@naver.com>
Date: Sat, 13 Jul 2024 00:04:00 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20amountToHangul=EC=9D=B4=20=EC=84=A0?=
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* fix: 호환성을 위해 배열의 마지막 요소 가져오는 부분 수정

* fix: 선행 0도 처리 가능하도록 amountToHangul 수정

* test: 선행 0 처리 테스트 코드 추가

* fix: 변수 네이밍 수정

* Create curvy-bats-nail.md

---------

Co-authored-by: 박찬혁 <pgg6713@gmail.com>
---
 .changeset/curvy-bats-nail.md |  5 +++++
 src/amountToHangul.spec.ts    | 12 +++++++++---
 src/amountToHangul.ts         |  8 +++++---
 3 files changed, 19 insertions(+), 6 deletions(-)
 create mode 100644 .changeset/curvy-bats-nail.md

diff --git a/.changeset/curvy-bats-nail.md b/.changeset/curvy-bats-nail.md
new file mode 100644
index 00000000..f1031f66
--- /dev/null
+++ b/.changeset/curvy-bats-nail.md
@@ -0,0 +1,5 @@
+---
+"es-hangul": patch
+---
+
+fix: amountToHangul이 선행 0이 있는 문자열을 잘못 변환하는 오류를 수정합니다.
diff --git a/src/amountToHangul.spec.ts b/src/amountToHangul.spec.ts
index f7c47c24..eae4c5ad 100644
--- a/src/amountToHangul.spec.ts
+++ b/src/amountToHangul.spec.ts
@@ -10,10 +10,10 @@ describe('amountToHangul', () => {
   });
 
   it('숫자로 된 금액이 80글자를 넘을 시 에러 발생', () => {
-    const longNumberString = '1'.repeat(81);    
+    const longNumberString = '1'.repeat(81);
     expect(() => amountToHangul(longNumberString)).toThrowError(`convert range exceeded : ${longNumberString}`);
-  })
-  
+  });
+
   it('숫자 외 문자를 무시하여 반환', () => {
     expect(amountToHangul('120,030원')).toEqual('일십이만삼십');
   });
@@ -31,4 +31,10 @@ describe('amountToHangul', () => {
     expect(amountToHangul(100000100)).toEqual('일억백');
     expect(amountToHangul(392.24)).toEqual('삼백구십이점이사');
   });
+
+  it('선행 0이 있는 경우 처리', () => {
+    expect(amountToHangul('01023')).toEqual('일천이십삼');
+    expect(amountToHangul('001023')).toEqual('일천이십삼');
+    expect(amountToHangul('0001023')).toEqual('일천이십삼');
+  });
 });
diff --git a/src/amountToHangul.ts b/src/amountToHangul.ts
index 3d70f9d5..ca43b335 100644
--- a/src/amountToHangul.ts
+++ b/src/amountToHangul.ts
@@ -26,19 +26,21 @@ export const HANGUL_NUMBERS_FOR_DECIMAL = ['영', '일', '이', '삼', '사', '
 export const HANGUL_CARDINAL = ['', '십', '백', '천'];
 
 export function amountToHangul(amount: string | number) {
-  const [integerPart, tempDecimalPart] = String(amount)
+  const [rawIntegerPart, rawDecimalPart] = String(amount)
     .replace(/[^\d.]+/g, '')
     .split('.');
 
+  const integerPart = rawIntegerPart !== '0' ? rawIntegerPart.replace(/^0+/, '') : rawIntegerPart;
+
   if (integerPart.length > HANGUL_DIGITS_MAX) {
     throw new Error(`convert range exceeded : ${amount}`);
   }
-  const decimalPart = tempDecimalPart?.replace(/0+$/, '');
+  const decimalPart = rawDecimalPart?.replace(/0+$/, '');
 
   const result = [];
   let pronunDigits = true;
 
-  if(integerPart === '0' || (integerPart === '' && tempDecimalPart)) {
+  if (integerPart === '0' || (integerPart === '' && rawDecimalPart)) {
     result.push(HANGUL_NUMBERS_FOR_DECIMAL[0]);
   } else {
     for (let i = 0; i < integerPart.length - 1; i++) {