Create 2180-count-integers-with-even-digit-sum.js

Author: everthis

2180-count-integers-with-even-digit-sum.js

@@ -0,0 +1,22 @@
+/**
+ * @param {number} num
+ * @return {number}
+ */
+var countEven = function(num) {
+  let res = 0
+  for(let i = 1; i <= num; i++) {
+    const tmp = sum(i)
+    if(tmp % 2 === 0) res++
+  }
+  
+  return res
+};
+
+function sum(e) {
+  let res = 0
+  while(e) {
+    res += e % 10
+    e = Math.floor(e/10)
+  }
+  return res
+}