Find maximum item of an Array by given key

find_max.js

const people = [
  { name: 'Naruto', age: 24 },
  { name: 'Sasuke', age: 32 },
  { name: 'Minato', age: 42 },
  { name: 'Kakashi', age: 36 }
]

const maxBy = (arr, key) => arr.reduce((max,obj) => {
  return max[key] >= obj[key] ? max : obj)
}, {})

maxBy(people, 'age')
// output: { name: 'Minato', age: 42 }