Functional JavaScript - https://hackernoon.com/rethinking-javascript-death-of-the-for-loop-c431564c84a8
const isKitten = cat => cat.months < 7
const getName = cat => cat.name
const getKittenNames = cats =>
cats.filter(isKitten)
.map(getName)
const cats = [
{ name: 'Mojo', months: 84 },
{ name: 'Mao-Mao', months: 34 },
{ name: 'Waffles', months: 4 },
{ name: 'Pickles', months: 6 }
]
const kittens = getKittenNames(cats)
console.log(kittens)