mergeArrays

//03.Merge Arrays
function mergeArrays(arr1, arr2) {
  'use strict'

  let thirdArr = []
  let output = ''
  for (let i = 0; i < arr1.length; i++) {

    if (i % 2 === 0)
      thirdArr[i] = +arr1[i] + +arr2[i]
    else
      thirdArr[i] = arr1[i] + arr2[i]

    if (i === arr1.length - 1)
      output += `${thirdArr[i]}`
    else
      output += `${thirdArr[i]} - `
  }
  console.log(output)
}