add: 除自身以外数组的乘积

README.md

@@ -366,6 +366,10 @@ LeetCode 与 LintCode 解题记录。此为个人练习仓库，代码中对重
 
   - LeetCode 1431. 拥有最多糖果的孩子 <https://leetcode-cn.com/problems/kids-with-the-greatest-number-of-candies/>
 
+- [除自身以外数组的乘积](src/array/product-of-array-except-self.js)
+
+  - LeetCode 238. 除自身以外数组的乘积 <https://leetcode-cn.com/problems/product-of-array-except-self/>
+
 ## 栈
 
 - [最大矩阵](src/stack/maximal-rectangle.js)

src/array/product-of-array-except-self.js

@@ -0,0 +1,21 @@
+/**
+ * @param {number[]} nums
+ * @return {number[]}
+ */
+export const productExceptSelf = function (nums) {
+  const ans = []
+  for (let i = 0, len = nums.length; i < len; i++) {
+    let tmpL = 1
+    let tmpR = 1
+    for (let j = 0; j < len; j++) {
+      if (j < i) {
+        tmpL *= nums[j]
+      } else if (j > i) {
+        tmpR *= nums[j]
+      }
+    }
+    ans.push(tmpL * tmpR)
+  }
+
+  return ans
+}

test/array/product-of-array-except-self.test.js

@@ -0,0 +1,5 @@
+import { productExceptSelf } from '../../src/array/product-of-array-except-self'
+
+test('除自身以外数组的乘积', () => {
+  expect(productExceptSelf([1, 2, 3, 4])).toEqual([24, 12, 8, 6])
+})