Create 2243-calculate-digit-sum-of-a-string.js

Author: everthis

2243-calculate-digit-sum-of-a-string.js

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+/**
+ * @param {string} s
+ * @param {number} k
+ * @return {string}
+ */
+const digitSum = function(s, k) {
+  let cur = s
+  while(cur.length > k) {
+    const arr = []
+    for(let i = 0; i < cur.length; i += k) {
+      let tmp = ''
+      for(let j = 0; j < k && i + j < cur.length; j++) {
+        tmp += cur[i + j]
+      }
+      arr.push(tmp)
+    }
+    arr.forEach((e, i) => {
+      let res = 0
+      for(let ch of e) res += +ch
+      arr[i] = '' +res
+    })
+    cur = arr.join('')
+    
+  }
+  return cur
+};