checkDistinct.js

amit265 · amit265 · commit 349517f3b45f · 2026-02-23T22:03:11.000+05:30
diff --git a/javascript/4_array-programs/checkDistinct.js b/javascript/4_array-programs/checkDistinct.js
@@ -0,0 +1,90 @@
+// 43. Check if an Array Contains only Unique Values
+
+// Using of JavaScript Set
+
+{
+  function checkDistinct(array) {
+    const checkSet = new Set(array);
+
+    return checkSet.size === array.length;
+  }
+  // Input 1
+  const input1 = [7, 8, 1, 5, 9];
+  console.log(checkDistinct(input1));
+
+  // Input 2
+  const input2 = [7, 8, 1, 5, 5];
+  console.log(checkDistinct(input2));
+}
+
+// Using of indexOf() Method
+
+{
+  function checkDistinct(array) {
+    for (let i = 0; i < array.length; i++) {
+      if (array.indexOf(array[i]) !== i) {
+        return false;
+      }
+    }
+    return true;
+  }
+  // Input1
+  const input1 = [7, 8, 1, 5, 9];
+  console.log(checkDistinct(input1));
+
+  //Input2
+  const input2 = [7, 8, 1, 5, 5];
+  console.log(checkDistinct(input2));
+}
+
+// Using Array.filter() and Array.includes()
+
+{
+  function hasUniqueValues(arr) {
+    return (
+      arr.filter((value, index, self) => self.indexOf(value) === index)
+        .length === arr.length
+    );
+  }
+  console.log(hasUniqueValues([1, 2, 3, 4, 5])); // true
+  console.log(hasUniqueValues([1, 2, 3, 4, 5, 6, 1])); // true
+}
+
+// Using Array.sort() and Array.every()
+
+{
+  function checkDistinct(array) {
+    array.sort((a, b) => a - b);
+
+    return array.every(
+      (value, index) => index === 0 || value !== array[index - 1],
+    );
+  }
+
+  // Input 1
+  const input1 = [7, 8, 1, 5, 9];
+  console.log(checkDistinct(input1));
+
+  // Input 2
+  const input2 = [7, 8, 1, 5, 5];
+  console.log(checkDistinct(input2));
+}
+
+// Using an object to track seen values
+{
+  function hasUniqueValues(arr) {
+    let seen = {};
+    for (let val of arr) {
+      if (seen[val]) {
+        return false;
+      }
+
+      seen[val] = true;
+    }
+
+    return true;
+  }
+
+  console.log(hasUniqueValues([1, 2, 3, 4, 4]));
+  console.log(hasUniqueValues([1, 2, 2, 4]));
+}
