JS Design Patterns: Factory Functions, see more at: https://medium.com/p/2adfe878e949

DESIGN_PATTERNS_factoryFunctions.js

const greet = name => ({
  sayHello: () => `Hello ${name}!`,
  sayGoodbye: () => `Goodbye ${name}!`,
});

const run = () => {
  const greetRicardo = greet("Ricardo");

  console.log(greetRicardo.sayHello());
  console.log(greetRicardo.sayGoodbye());
};

run();