kaprekar-number-checker

Algorithms/kaprekar-number-checker.js

@@ -0,0 +1,25 @@
+function isKaprekar(k) {
+    var n = length(k);
+    var square = k * k;
+
+    var firstPeice = String(square).substring(0, length(square) - n);
+    var secondPiece = String(square).substring(length(square) - n);
+
+    var sumOfPieces = Number(firstPeice) + Number(secondPiece);
+
+    var outputMessage = 
+        'inputNumber: ' + k + ', ' +
+        'Sum: ' + sumOfPieces;
+
+    return {
+        isKaprekar: sumOfPieces === k,
+        explanation: outputMessage
+    };
+}
+
+function length(value) {
+    return String(value).length;
+}
+
+
+console.log(isKaprekar(45))