Condense Array to Number

function sumAll(nums){
  while(nums.length > 1){
      let condensed = [nums.length-1];
      for(let i = 0;i < nums.length - 1;i++){
          condensed[i] = Number(nums[i]) + Number(nums[i+1]);
      }
      nums = condensed;
  }
  console.log(nums[0])
}
sumAll(['5','0','4','1','2'])