filter-find.js

const kittens = animals.find(x => x.type === 'cat' && x.ageMonths < 12);
const kittens = animals.find(animal => animal.type === 'cat' && animal.ageMonths < 12);
const kittens = animals.filter(animal => animal.type === 'cat').filter(cat => cat.ageMonths < 12);

const kittens = animals.filter(onlyKittens);
const onlyKittens = ({ type, ageMonths }) => type === 'cat' && ageMonths < 12;

// When to use map?
// .map() when you want to transform elements in an array.

// When to use filter?
// .filter() when you want to select a subset of multiple elements from an array.

// When to use find?
// .find() When you want to select a single element from an array.

// When to use reduce?
// .reduce() when you want derive a single value from multiple elements in an array.