Subset with maximum sum in JavaScript

We are required to write a JavaScript function that takes in an array of integers. Our function is required find the subset of non−adjacent elements with the maximum sum.

And finally, the function should calculate and return the sum of that subset.

For example −

If the input array is −

const arr = [3, 5, 7, 8, 10];

Then the output should be 20 because the non−adjacent subset of numbers will be 3, 7 and 10.

Example

The code for this will be −

const arr = [3, 5, 7, 8, 10];
const maxSubsetSum = (arr = []) => {
   let min = −Infinity
   const helper = (arr, ind) => {
      if ( ind < 0 ){
         return min
      };
      let inc = helper(arr, ind−2);
      let notInc = helper(arr, ind−1);
      inc = inc == min ? arr[ind] : Math.max(arr[ind], arr[ind] + inc);
      return Math.max( inc, notInc );
   };
   return helper(arr, arr.length − 1);
};
console.log(maxSubsetSum(arr));

Output

And the output in the console will be −

20