mauricior

// Examples of https://medium.com/@alvaro.saburido/set-theory-for-arrays-in-es6-eb2f20a61848
const arrA = [1, 3, 4, 5];
const arrB = [1, 2, 5, 6, 7];

const intersection = arrA.filter((x) => arrB.includes(x));
console.log('Intersection: ', intersection);
console.log('Expected: [1,5]');

const difference = arrA.filter((x) => !arrB.includes(x));
console.log('\nDifference: ', difference);

mauricior

import React from 'react';
import { shallow } from 'enzyme';

const Item = text => <p>Item {text}</p>;

const Composition = ({ showB }) => (
  <p>
    <Item text="A" />
    {showB && <Item text="B" />}
  </p>);