array find

array.find.js

// our getValue function from earlier
const getValue = property => obj => obj && obj[property];

// Lets use a pipe function to combine the two functions:
const pipe = (func1, func2) => (...args) => func2(func1(...args));

// our list of user objects
const users = [{
  name: 'sarah',
  id: '12345',
  country: 'Australia'
},
{
  name: 'bob',
  id: '34325',
  country 'New Zealand'
},
{
  name: 'Sam',
  id: '42524',
  country: 'Australia'
},
{
  name: 'Roger',
  country: 'USA',
  id: '5135135'
}];

const usersNamedBob = pipe(getValue('name'), valueEquals('bob'));

users.find(usersNamedBob);

// result:
{
    name: 'bob',
    id: '34325',
    country: 'New Zealand'
}

// If an array returns an array, we can continue to chain our higher order functions:
users.filter(usersNamedBob).map(getValue('id')); // result: ['34325'];