conraddavisjr

from typing import TypedDict

class Person(TypedDict):
  name: str
  age: int

def greet(person: Person) -> str:
  return f"Hello, {person['name']}!"

conraddavisjr

interface Person {
  name: string;
  age: number;
}

function greet(person: Person): string {
  return `Hello, ${person.name}!`;
}

conraddavisjr

// 1) create a type, and name it TShirt
type TShirt = {
  color: string;
  size: 'small' | 'medium' | 'large'; // this is a union, meaning the size could be *one* of these values
  brand: string;
};

// 2) create a variable and identify it as a TShirt. Then assign the
// object literal to that variable.
const largeBlueTShirt: TShirt = {

conraddavisjr

type TShirt = { color: string, size: 'S' | 'M' | 'L', brand: string}

conraddavisjr

interface GuestUser {
  /** the user's unique id */
  id: string;
  /** with this modification, now the role can be 'guest' or any number value such as 123, or 987437
  role: 'guest' | number;
  // or,  even more specifically, if you didn't want just any number, only 78
  role: 'guest' | 78;
}

conraddavisjr

function addTwoNumbers(firstNumber: number, secondNumber: number) {
  return firstNumber + secondNumber;
}

conraddavisjr

interface SimpleHouse {
  price: number; // 10000;
  color: string; // any color. If it's a string, it can be any name
  numberOfWindows: 0 | 1 | 2; // it can be 0, 1, or 2
  hasChimney: boolean; // true;
}

conraddavisjr

interface SimpleHouse {
  price: number;
  color: string;
  numberOfWindows: 0 | 1 | 2;
  hasChimney: boolean;
}