Condense Array to Number

function solve(nums) {
  while(nums.length > 1){
    let condensed = [nums.length -1];
    for(let i = 0;i < nums.length -1;i++){
       condensed[i] = nums[i] + nums[i + 1];
    }
    nums = condensed;
  }
  console.log(nums[0])
}