patarkf

Step by step to install Scala + Play Framework in Ubuntu 14.04 with Activator.

Install Scala

sudo apt-get remove scala-library scala
wget http://www.scala-lang.org/files/archive/scala-2.11.6.deb
sudo dpkg -i scala-2.11.6.deb
sudo apt-get update
sudo apt-get install scala

patarkf

/**
 * Always waits one second, then "toss a coin", having 
 * a 50/50 chance to get either true or false. Throws
 * an error if false.
 */
async function waitAndMaybeReject() {
    await new Promise(r => setTimeout(r, 1000));

    const isHeads = Boolean(Math.round(Math.random()));

patarkf

function getFromGitHub() {
  const userName = 'patarkf';
  const url = 'https://api.github.com/users';

  fetch(`${url}/${userName}/repos`)
    .then(reposResponse => {
      return reposResponse.json();
    })
    .then(userRepos => {
      console.log(userRepos);

patarkf

async function getFromGitHub() {
  try {
    const userName = 'patarkf';
    const url = 'https://api.github.com/users';
    const reposResponse = await fetch(`${url}/${userName}/repos`);
    const userRepos = await reposResponse.json();

    console.log(userRepos);
  } catch (error) {
    console.log(error);

patarkf

function makeRequest() {
  try {
    fetch('foo')
      .then(response => {

        const result = JSON.parse(response);
        console.log(result);
      })
      .catch(error => {
        console.log(error);

patarkf

async function makeRequest() {
  try {
    const result = JSON.parse(await fetch('foo'));
    
    console.log(result);
  } catch (error) {
    console.log(error);
  }
} 

patarkf

return getAsyncResult() // A

patarkf

const assert = require('assert');

test('Testing async code', async () => {
    const first = await getAsyncResult();
    assert.strictEqual(first, 'foo');
    const second = await getAsyncResult2();
    assert.strictEqual(second, 'bar');
});

patarkf

const assert = require('assert');

test('Testing async code', () => {
    getAsyncResult() // A
    .then(first => {
        assert.strictEqual(first, 'foo'); // B
        return getAsyncResult2();
    })
    .then(second => {
        assert.strictEqual(second, 'bar'); // C

patarkf

async function getConcurrently() { 
    let promises = []; 
    promises.push(getUsers()); 
    promises.push(getCategories()); 
    promises.push(getProducts());

    let [users, categories, products] = await Promise.all(promises); 
}