gskachkov

Promise.reject('reject')
  .finally(() => console.log('finally#1'))
  .catch(error => console.log('catch#1', error))
  .catch(error => console.log('catch#2', error));
//finally#1
//catch#1 reject

Promise.resolve('resolve')
  .then(result=> { console.log('then#1', result); return Promise.resolve('next-step'); })
  .finally(() => console.log('finally#1'))

gskachkov

Promise.reject('error #1')
  .then(value => console.log('level-1:', value), error => console.log('level-1-error:', error))
  .catch(error => console.log('error in catch:', error))
  .finally(() => console.log('finally'))
  .then(value => console.log('level-2:', value), error => console.log('level-2-error:', value));

// level-1-error: error #1
// finally
// level-2: undefined

gskachkov

const promise = new Promise(resolve => {
  setTimeout(()=>resolve('success'));
});

const startOperation = () => { console.log('start'); };
const finishOperation = () => { console.log('finish'); };

startOperation();

promise

gskachkov

const promise = new Promise(resolve => {
  setTimeout(()=>resolve('success'));
});

const startOperation = () => { console.log('start'); };
const finishOperation = () => { console.log('finish'); };

startOperation();

promise

gskachkov

async function asyncFoo(i) {
  return Promise.resolve(i);
}

async function main() {
  console.log(`Start`);
  const start = Date.now()

  let total = 0
  for (let i = 0;i < 550000; i++) {

gskachkov

var assertNotThrow = function (cb) {
    var noError = false;
    try {
        cb();
        noError = true;
    } catch (e) {}
    return noError;
}
function f() {   
    var foo; 

gskachkov

const importObject = {
  imports: {
    foo: arg => {
      console.log('Imported value from WASM', arg);
    }
  }
};

gskachkov

async function getResponseSize(url) {
  const response = await fetch(url);
  const reader = response.body.getReader();
  let total = 0;

  while (true) {
    const {done, value} = await reader.read();
    if (done) return total;
    total += value.length;
  }

gskachkov

var asyncThrow = async () => { throw new Error('Rejected-value') };
var reject = async () => Promise.reject('Rejected-value');

var foo = async () => { 
  try {
    await asyncThrow();
  } catch (e) { 
    console.log('Catched error:', e); 
  }
  try { 

gskachkov

async function asyncRandomNumbers() {
  const response = await fetch('https://www.random.org/decimal-fractions/?num=1&dec=10&col=1&format=plain&rnd=new');
  return Number(await response.text());
}

async function getUsers(count) {
  const response = await fetch("https://randomuser.me/api/?results=10", { method: "GET" }); 
  return JSON.parse(await response.text());
};