high order function reducer

reducer.js

const votes = [
  'tacos',
  'pizza',
  'pizza',
  'tacos',
  'fries',
  'ice cream',
  'ice cream',
  'pizza'
]

const result = votes.reduce((tally,vote) => {
  if(!tally[vote]){
    tally[vote] = 1
  }else{
    tally[vote] += 1 
  }
  return tally;
}, {})

console.log(result) // {tacos: 2, pizza: 3, fries: 1, ice cream: 2}