Discussion on: JS Performance: Perhaps We Shouldn't Always Use Arrays

I love maps! I have often found myself getting pushed to use arrays despite my preferences by frameworks/libraries I am using or the simple convenience of being able to use .forEach(), .map(), etc.

At least In ES6-land we also finally have an actual Map object which gives us the ability to iterate over entries, easy size determination, using things other than strings as keys... probably other goodies.

const catsMap = new Map([
  ['Aeris', { name: 'Aeris', isFavourite: true }],
  ['Juri', { name: 'Juri' }],
  ['Dante', { name: 'Dante' }],
  ['Frankenstein', { name: 'Frankenstein' }],
  ['Aeris', { name: 'Aeris' }],
])

const findMyCat =
    requestedCat => catsMap.get(requestedCat)

console.log(findMyCat('Dante'))
console.log(findMyCat('Marmalade'))