🟢 Solve problem 387

Author: AF2B

swift/387.swift

@@ -0,0 +1,17 @@
+class Solution {
+    func firstUniqChar(_ s: String) -> Int {
+        var dict: [Character : Int] = [:]
+
+        for character in s {
+            dict[character, default: 0] += 1
+        }
+
+        for (i, v) in s.enumerated() {
+            if dict[v] == 1 {
+                return i
+            }
+        }
+
+        return -1
+    }
+}