Concatenated Sum

concatenated-sum/index.js

@@ -0,0 +1,6 @@
+// https://www.codewars.com/kata/concatenated-sum/train/javascript
+
+const checkConcatenatedSum = (num, n) => {
+  num = Math.abs(num);
+  return (num+'').split('').map(d=>d.repeat(n)).reduce((a,n)=>a+(+n),0) === num;
+};