some

som.js

@@ -0,0 +1,21 @@
+console.time('st')
+const getNumSum = (num) => {
+  let buf = num
+  let res = 0;
+  
+  while (buf > 0) {
+    res = res + buf % 10
+    buf = Math.floor(buf / 10)
+  }
+  return res
+}
+
+const end =  1000000000
+  let result = 0
+  for(let i = 1; i <= end; i++){
+    result += getNumSum(i)
+  }
+
+  
+  console.log(result)
+console.timeEnd('st')