36-202-Happy-Number

jdcodebase · jdcodebase · commit def212d4d4a3 · 2025-07-04T15:53:58.000+05:30
diff --git a/36-202-Happy-Number.js b/36-202-Happy-Number.js
@@ -0,0 +1,27 @@
+var isHappy = function (number) {
+  let seenNumbers = new Set();
+
+  while (number !== 1) {
+    if (seenNumbers.has(number)) {
+      return false;
+    }
+
+    seenNumbers.add(number);
+
+    let current = number;
+    let sumOfSquares = 0;
+
+    while (current > 0) {
+      let digit = current % 10;
+      sumOfSquares += digit * digit;
+      current = Math.floor(current / 10);
+    }
+
+    number = sumOfSquares;
+  }
+
+  return true;
+};
+
+console.log(isHappy(19));
+console.log(isHappy(2));
