feat: add typescript solution to lc problem: No.0387.First Unique Character in a String

Author: zhaocchen

solution/0300-0399/0387.First Unique Character in a String/README.md

@@ -72,6 +72,21 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function firstUniqChar(s: string): number {
+    let record = new Map();
+    for (let cur of [...s]) {
+        record.set(cur, record.has(cur))
+    }
+    for (let i =0 ; i < s.length; i++) {
+        if (!record.get(s[i])) return i;
+    }
+    return -1;
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0387.First Unique Character in a String/README_EN.md

@@ -66,6 +66,21 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function firstUniqChar(s: string): number {
+    let record = new Map();
+    for (let cur of [...s]) {
+        record.set(cur, record.has(cur))
+    }
+    for (let i =0 ; i < s.length; i++) {
+        if (!record.get(s[i])) return i;
+    }
+    return -1;
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0387.First Unique Character in a String/Solution.ts

@@ -0,0 +1,10 @@
+function firstUniqChar(s: string): number {
+    let record = new Map();
+    for (let cur of [...s]) {
+        record.set(cur, record.has(cur))
+    }
+    for (let i =0 ; i < s.length; i++) {
+        if (!record.get(s[i])) return i;
+    }
+    return -1;
+};