elersong · February 11, 2021 21:03 · Feb 11, 2021
diff --git a/unique.js b/unique.js
@@ -0,0 +1,14 @@
+  // test if string contains any duplicate chars
+  function isUniq(str) {
+    let letters = {};
+    str.split('').forEach(char => {
+      if (letters[char]) {
+        letters[char] = false;
+      } else {
+        letters[char] = true;
+      }
+    });
+
+    // If the letters object has any false values, there's one or more duplicates
+    return !Object.values(letters).includes(false);
+  }