add Easy_387_First_Unique_Character_in_a_String

Author: zongyanqi

Easy_387_First_Unique_Character_in_a_String.js

@@ -0,0 +1,30 @@
+/**
+ * Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.
+
+ Examples:
+
+ s = "leetcode"
+ return 0.
+
+ s = "loveleetcode",
+ return 2.
+ Note: You may assume the string contain only lowercase letters.
+
+
+ */
+
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var firstUniqChar = function (s) {
+
+    for (var i = 0; i < s.length; i++) {
+        var ch = s[i];
+        if (s.lastIndexOf(ch) === s.indexOf(ch)) return i;
+    }
+    return -1;
+};
+
+console.log(firstUniqChar('leetcode'));
+console.log(firstUniqChar('loveleetcode'));