The First Non Repeated Character In A String

The First Non Repeated Character In A String

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+/*You need to write a function, that returns the first non-repeated character in the given string.
+
+For example for string "test" function should return 'e'.
+For string "teeter" function should return 'r'.
+
+If a string contains all unique characters, then return just the first character of the string.
+Example: for input "trend" function should return 't'
+
+You can assume, that the input string has always non-zero length.
+
+If there is no repeating character, return null in JS or Java, and None in Python.*/
+
+
+
+function firstNonRepeated(s) {
+    for (let i = 0; i < s.length; i++) {
+        var c = s.charAt(i)
+        if (s.indexOf(c) == i && s.indexOf(c, i + 1) == -1) return c
+    }
+    return null
+}