enums.ts

//Enumarations
//Why we need to use this or when need to use it
// const beforeLoad = 'beforeLoad';
// const loading = 'loading';
// const loaded = 'loaded';

//NOTE
enum loadingState {
  beforeLoad = 'beforeLoad',
  loading = 'loading',
  loaded = 'loaded',
}
//NOTE a better way for debug
const englishLoadingState = {
  [loadingState.beforeLoad]: 'Before Load',
};

const isLoading = (state: loadingState) => state === loadingState.loading;
//here complaint, and check the type must between above three type
// console.log(isLoading('dogs'));

//What is literal type

function rollDice(dict: 1 | 2 | 3): number {
  let pip = 0;
  for (let i = 0; i < dict; i++) {
    pip += Math.floor(Math.random() * 5) + 1;
  }
  return pip;
}
//4 is not allow here if we define the dict number literal type
// console.log(rollDice(4));
console.log(rollDice(3));

//here we create function overload
function sendEveng(name: 'addCart', data: { productId: number }): void;
function sendEveng(name: 'checkOut', data: { cartCount: number }): void;
function sendEveng(name: string, data: unknown): void {
  console.log(`${name}: ${JSON.stringify(data)}`);
}

sendEvent('checkOut', { productId: 12323 });