Create 1134-armstrong-number.js

Author: everthis

1134-armstrong-number.js

@@ -0,0 +1,20 @@
+/**
+ * @param {number} n
+ * @return {boolean}
+ */
+const isArmstrong = function(n) {
+    //number of digits in N
+    let k = ~~(Math.log10(n) + 1);
+    //temporary variable (so we dont modify N)
+    let x = n;
+    //to hold sum
+    let sum = 0;
+    //get each digit
+    while (x !== 0) {
+        //add this digit^k to sum
+        sum += Math.pow(x % 10, k);
+        //get next digit
+        x = ~~(x/10);
+    }
+    return sum == n;
+};