Javascript Functions

// Person: {
//  name: string,
//  age: number,
// }

to represent the 'shape' of a Person.

When you have functions like the following, you can use the shorthand to write the type of the input and output.

function getName(person) {
  return person.name;
}

function getAge(person) {
  return person.age;
}

function makePerson(name, age) {
  return {
    name: name,
    age: age
  };
}

function birthday(person) {
  person.age += 1;
  return person;
}

// Point: {
// x: number
// y: number
// name: string
//}

function getDistance(pointA, pointB) {
  return Math.sqrt((pointA.x - pointB.x) ** 2 + (pointA.y - pointB.y) ** 2);
}