Syntax error Finding the group with largest elements with same digit sum in JavaScript

Finding the group with largest elements with same digit sum in JavaScript

We are required to write a JavaScript function that takes in a positive integer, say n, as the only argument.

The function should first group the integers from 1 to n to subarray where a specific subarray contains all the elements contains a specific digit sum. Then the function should examine each subarray and return the length of that subarray which contains the most elements.

For example −

If the input number is −

const num = 15;

Then the output should be −

const output = 2;

because the groups are −

[1, 10], [2, 11], [3, 12], [4, 13], [5, 14], [6, 15], [7], [8], [9]

Example

Following is the code −

const num = 67;
const countLargestGroup = (num = 1) => {
   if(num < 10){
      return num;
   };
   let res = 0;
   let temp = 0;
   let map = {};
   for(let i = 1; i <= num; i++){
      let sum = 0;
      let num = i;
      while (num) {
         sum += num % 10;
         num = Math.floor(num / 10);
      }
      if(map[sum] != undefined){
         map[sum]++;
      } else {
         map[sum] = 1;
      }
   };
   for (const key of Object.keys(map)) {
      if(temp == map[key]){
         res++;
      }
      else if(temp < map[key]){
         res = 1;
         temp = map[key];
      }
   };
   return res;
};
console.log(countLargestGroup(num));

Output

Following is the console output −

4
Updated on: 2021-01-27T06:31:10+05:30

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