Equal Sums

//06.Equal Sums
function equalSums(arr) {

  for (let i = 0; i < arr.length; i++)
    if (isEqual(arr, i)) {
      console.log(i)
      return
    }
  console.log('no')

  function isEqual(arr, index) {
    let leftSum = 0
    let rightSum = 0
    for (let i = 0; i < index; i++)
      leftSum += arr[i]
    for (let i = index + 1; i < arr.length; i++)
      rightSum += arr[i]

    if (leftSum === rightSum)
      return true
    else
      return false
  }
}
equalSums0([1, 2, 3, 3])

const update = function (x, y) {
  // Do something with x and y
};

function equalSums0(arr) {
  'use strict'

  const isEqual0 = function (arr, index) {
    let leftSum = 0
    let rightSum = 0
    for (let i = 0; i < index; i++)
      leftSum += arr[i]
    for (let i = index + 1; i < arr.length; i++)
      rightSum += arr[i]

    return (leftSum === rightSum) ? true : false
  }

  for (let i = 0; i < arr.length; i++)
    if (isEqual0(arr, i)) {
      console.log(i)
      return
    }
  console.log('no')
}