promises.ts

function exampleOne() {
  console.log('One');
  return Promise.resolve()
    .then(() => console.log('Two'))
    .catch(() => console.log('Three'))
    .finally(() => console.log('Four'));
}

function exampleTwo() {
  console.log('One');
  return Promise.resolve()
    .then(() => console.log('Two'))
    .catch(() => console.log('Three'))
    .finally(() => console.log('Four'))
    .then(() => console.log('Five'))
    .catch(() => console.log('Six'))
    .finally(() => console.log('Seven'));
}

function exampleThree() {
  console.log('One');
  return Promise.reject()
    .then(() => console.log('Two'))
    .catch(() => console.log('Three'))
    .finally(() => console.log('Four'))
    .then(() => console.log('Five'))
    .catch(() => console.log('Six'))
    .finally(() => console.log('Seven'));
}
function exampleFour() {
  console.log('One');
  return new Promise((resolve, reject) => {
    console.log('Two');
    resolve(null);
    console.log('Three');
    reject(new Error('Four'));
    console.log('Five');
  });
}

function exampleFive() {
  console.log('One');
  return new Promise((resolve, reject) => {
    console.log('Two');
    new Promise((resolve, reject) => {
      resolve("Three");
      reject(new Error('Four'));
    }).then((val) => {
      console.log(val)
      reject(val);
    });
  }).catch((val) => console.log(val));
}


function exampleSix() {
  console.log('One');
  Promise.resolve().then(() => console.log('Two'));
  console.log('Three');
  return;
}

async function exampleSeven() {
  console.log('One');
  await Promise.resolve().then(() => console.log('Two'));
  console.log('Three');
  return;
}


const examples = [exampleOne, exampleTwo, exampleThree, exampleFour, exampleFive, exampleSix, exampleSeven];

(async function main() {
  for (const example of examples) {
    console.log();
    console.log(example.name);
    console.log('-------');

    await example();
  }
})();

// https://replit.com/@MylesScolnick/promises?v=1#index.js