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Functional Programming Patterns With RamdaJS!

Use With Arrays

Lenses are great for arrays too! (2 min. read)

We'll cover the following...

What we just learned applies to arrays as well, but with one change. Instead of lensProp use lensIndex.

Javascript (babel-node)
import { lensIndex, view } from 'ramda';
const person = {
  firstName: 'Bobo',
  lastName: 'Flakes',
  friends: [{
    firstName: 'Clark',
    lastName: 'Kent'
  }, {
    firstName: 'Bruce',
    lastName: 'Wayne'
  }, {
    firstName: 'Barry',
    lastName: 'Allen'
  }]
};
const getThirdFriend = lensIndex(2);
const result = view(getThirdFriend, person.friends);
console.log({ result });