Closures

closures.js

const outerValue = 'samurai';
let later;

function outerFunction() {
  const innerValue = 'ninja';

  function innerFunction() {
    console.log(outerValue === 'samurai', 'I can see the samurai.');
    console.log(innerValue === 'ninja', 'I can see the ninja.');
  }

  later = innerFunction;
}

outerFunction();
later();

hidden-ninja.js

const samurai = () => 'samurai here';

const ninja = () => {
  const hiddenNinja = () => 'ninja here';

  return hiddenNinja();
};

console.log(samurai() === 'samurai here', 'A samurai');
console.log(ninja() === 'ninja here', 'A ninja');