From 9c4e02544987a3b96252f7e2c62cebd530375283 Mon Sep 17 00:00:00 2001
From: Leopen <790480953@qq.com>
Date: Sat, 20 Aug 2022 15:40:50 +0800
Subject: [PATCH 1/2] =?UTF-8?q?feat:=20=E5=AE=9E=E7=8E=B0=E4=BA=86?=
 =?UTF-8?q?=E4=B8=A4=E4=B8=AA=E5=A4=A7=E6=95=B0=E7=9B=B8=E5=8A=A0=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/add.js        | 29 ++++++++++++++++++++++++++---
 test/test.spec.js |  8 +++++---
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/lib/add.js b/lib/add.js
index 1714b95..b69edd8 100644
--- a/lib/add.js
+++ b/lib/add.js
@@ -1,5 +1,28 @@
-function add() {
-  // 实现该函数
+function add(firstNumber, secondNumber) {
+  const [shortNumber, longNumber] =
+    firstNumber.length < secondNumber.length
+      ? [firstNumber, secondNumber]
+      : [secondNumber, firstNumber];
+
+  let result = '';
+  let lastSumLargeThanTen = false;
+
+  for (let i = shortNumber.length - 1; i >= 0; i--) {
+    const sum =
+      parseInt(shortNumber.substring(i, i + 1)) +
+      parseInt(longNumber.substring(i, i + 1));
+
+    if (lastSumLargeThanTen) {
+      result = sum + parseInt(result.substring(0, 1)) + result.substring(1);
+    } else {
+      result = sum + result;
+    }
+    lastSumLargeThanTen = sum > 10;
+  }
+
+  return (
+    longNumber.substring(0, longNumber.length - shortNumber.length) + result
+  );
 }
 
-module.exports = add
\ No newline at end of file
+module.exports = add;
diff --git a/test/test.spec.js b/test/test.spec.js
index 935b70e..a539599 100644
--- a/test/test.spec.js
+++ b/test/test.spec.js
@@ -4,8 +4,10 @@ describe('大数相加add方法', function () {
   test('字符串"42329"加上字符串"21532"等于"63861"', function () {
     expect(add('42329', '21532')).toBe('63861')
   })
-  
+
   test('"843529812342341234"加上"236124361425345435"等于"1079654173767686669"', function () {
-    expect(add('843529812342341234', '236124361425345435')).toBe('1079654173767686669')
+    expect(add('843529812342341234', '236124361425345435')).toBe(
+      '1079654173767686669'
+    )
   })
-})
\ No newline at end of file
+})

From 67d9b953d367627c1773ccb254d94cb4d1d8cc75 Mon Sep 17 00:00:00 2001
From: Leopen <790480953@qq.com>
Date: Sat, 20 Aug 2022 15:43:42 +0800
Subject: [PATCH 2/2] =?UTF-8?q?feat:=20=E4=BD=BF=E7=94=A8=20at=20=E6=9B=BF?=
 =?UTF-8?q?=E4=BB=A3=20substring=20=E5=AE=9E=E7=8E=B0=E5=A4=A7=E6=95=B0?=
 =?UTF-8?q?=E7=9B=B8=E5=8A=A0=EF=BC=8Cnode=20=E7=89=88=E6=9C=AC=E8=A6=81?=
 =?UTF-8?q?=E6=B1=82=2016.6.0=20=E5=8F=8A=E4=BB=A5=E4=B8=8A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/add-v16.js    | 26 ++++++++++++++++++++++++++
 test/test.spec.js |  1 +
 2 files changed, 27 insertions(+)
 create mode 100644 lib/add-v16.js

diff --git a/lib/add-v16.js b/lib/add-v16.js
new file mode 100644
index 0000000..40308b4
--- /dev/null
+++ b/lib/add-v16.js
@@ -0,0 +1,26 @@
+function add(firstNumber, secondNumber) {
+  const [shortNumber, longNumber] =
+    firstNumber.length < secondNumber.length
+      ? [firstNumber, secondNumber]
+      : [secondNumber, firstNumber];
+
+  let result = '';
+  let lastSumLargeThanTen = false;
+
+  for (let i = -1; i >= -shortNumber.length; i--) {
+    const sum = parseInt(shortNumber.at(i)) + parseInt(longNumber.at(i));
+
+    if (lastSumLargeThanTen) {
+      result = sum + parseInt(result.at(0)) + result.substring(1);
+    } else {
+      result = sum + result;
+    }
+    lastSumLargeThanTen = sum > 10;
+  }
+
+  return (
+    longNumber.substring(0, longNumber.length - shortNumber.length) + result
+  );
+}
+
+module.exports = add;
diff --git a/test/test.spec.js b/test/test.spec.js
index a539599..ccdf10f 100644
--- a/test/test.spec.js
+++ b/test/test.spec.js
@@ -1,4 +1,5 @@
 var add = require('../lib/add')
+// var add = require('../lib/add-v16');
 
 describe('大数相加add方法', function () {
   test('字符串"42329"加上字符串"21532"等于"63861"', function () {