1st homework

gistfile1.txt

// [1,2,3,4,5,6]

const recursive = (arr, i) => arr.length === i ? 0 : (arr[i] + recursive(arr, i+1));
const recursiveWrapper = (arr) => recursive(arr, 0);
const recursiveTail = (arr, i, v)=> arr.length === i ? v : recursiveTail(arr, i+1, v+arr[i]);  
const recursiveTailWrapper = (arr) => recursiveTail(arr, 0, 0);
const recursiveToFor = (arr) => {
  let sum = 0;
  for (let i = arr.length -1; i>=0; i--) {
    sum+= arr[i]
  }
  return sum;
}