JS Function Compose

func-compose.js

function compose(...functions) {
  return argument => functions.reduceRight((acc, current) => current(acc), argument);
}

function pipe(...functions) {
  return argument => functions.reduce((acc, current) => current(acc), argument);
}

const users = [
  {
    username: 'John Doe 1',
    age: 5,
  },
  {
    username: 'John Doe 2',
    age: 10,
  },
  {
    username: 'John Doe 3',
    age: 20,
  },
  {
    username: 'John Doe 4',
    age: 30,
  },
  {
    username: 'John Doe 5',
    age: 40,
  },
  {
    username: 'John Doe 6',
    age: 50,
  },
];

const result = compose(
  (users) => users.filter(user => user.age > 11),
  (users) => users.map(user => {
    user.age = user.age + 1;

    return user;
  }),
);

console.log('result', result(users));