reducing an object into an object, array, or int

reducedfruits.js

const fruits = {
  apple: 'better',
  banana: 'good',
  peach: 'ok',
  pear: 'good'
}

Object
  .entries(fruits)
  .reduce((goodFruit, [fruit, quality]) => {
    if (quality === 'good') goodFruit[fruit] = quality
    return goodFruit
  }, {})

Object
  .entries(fruits)
  .reduce((goodFruit, [fruit, quality]) => {
    if (quality === 'good') goodFruit.push(fruit)
    return goodFruit
  }, [])

Object
  .values(fruits)
  .reduce((goodFruit, quality) =>
    quality === 'good' ? (goodFruit + 1) : goodFruit
  , 0)

Object
  .entries(fruits)
  .filter(([fruit, quality]) => quality === 'good')
  .map(([fruit, quality]) => fruit)