feat: add js solution to lc problem: No.0137

Author: rain84

solution/0100-0199/0137.Single Number II/README.md

@@ -146,6 +146,19 @@ function singleNumber(nums: number[]): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function singleNumber(nums) {
+    let ans = 0;
+    for (let i = 0; i < 32; i++) {
+        const count = nums.reduce((r, v) => r + ((v >> i) & 1), 0);
+        ans |= count % 3 << i;
+    }
+    return ans;
+}
+```
+
 #### Rust
 
 ```rust

solution/0100-0199/0137.Single Number II/README_EN.md

@@ -137,6 +137,19 @@ function singleNumber(nums: number[]): number {
 }
 ```
 
+#### JavaScript
+
+```js
+function singleNumber(nums) {
+    let ans = 0;
+    for (let i = 0; i < 32; i++) {
+        const count = nums.reduce((r, v) => r + ((v >> i) & 1), 0);
+        ans |= count % 3 << i;
+    }
+    return ans;
+}
+```
+
 #### Rust
 
 ```rust

solution/0100-0199/0137.Single Number II/Solution.js

@@ -0,0 +1,8 @@
+function singleNumber(nums) {
+    let ans = 0;
+    for (let i = 0; i < 32; i++) {
+        const count = nums.reduce((r, v) => r + ((v >> i) & 1), 0);
+        ans |= count % 3 << i;
+    }
+    return ans;
+}