[A map key] A map can take any type of key! #map #typescript

cool-maps.ts

const map = new Map();
map.set(1, 'simple');

console.log(map.get(1));
// 'simple'

const person = {
  name: 'John',
  surname: 'Doe'
};
map.set(person, true);

console.log(map.get(person));
// true

class MyClass {
  
  public hello() {
    console.log('hello');
  }
}
map.set(MyClass, {...map.get(MyClass), internal: true });
map.set(MyClass, {...map.get(MyClass), beta: true });
console.log(map.get(MyClass));
// {
//   internal: true,
//   beta: true
// }