二进制求和

README.md

@@ -448,6 +448,11 @@ LeetCode 与 LintCode 解题记录。此为个人练习仓库，代码中对重
   - LeetCode 15. 三数之和 <https://leetcode-cn.com/problems/3sum/>
   - LintCode 57. 三数之和 <https://www.lintcode.com/problem/3sum/description>
 
+- [二进制求和](src/math/add-binary.js)
+
+  - LeetCode 67. 二进制求和 <https://leetcode-cn.com/problems/add-binary/>
+  - LeetCode 408. 二进制求和 <https://www.lintcode.com/problem/add-binary/description>
+
 ## 堆
 
 - [超级丑数](src/stack/super-ugly-number.js)【未完成】

src/math/add-binary.js

@@ -0,0 +1,9 @@
+/**
+ * @param {string} a
+ * @param {string} b
+ * @return {string}
+ */
+export const addBinary = function (a, b) {
+  // eslint-disable-next-line no-undef
+  return (BigInt('0b' + a) + BigInt('0b' + b)).toString(2)
+}

test/math/add-binary.test.js

@@ -0,0 +1,6 @@
+import { addBinary } from '../../src/math/add-binary'
+
+test('二进制求和', () => {
+  expect(addBinary('11', '1')).toEqual('100')
+  expect(addBinary('1010', '1011')).toEqual('10101')
+})