vsashyn

// CLI
// 1. yarn init
// 2. yarn add @babel/core @babel/preset-env babel-loader webpack webpack-cli webpack-dev-server --dev
// 3. Add webpack.config.js
// 4. Add babel.config.js
// 5. Add script '"watch": "webpack-dev-server"
// Enjoy <3

vsashyn

/**
 * Async iterators simple example.
 *
 * by Dmitry Soshnikov <[email protected]>
 * MIT Style License, 2018
 */

async function* streamChunks() {
  yield genChunk(1);
  yield genChunk(2);

vsashyn

var Middleware = function() {};

Middleware.prototype.use = function(fn) {
  var self = this;

  this.go = (function(stack) {
    return function(next) {
      stack.call(self, function() {
        fn.call(self, next.bind(self));
      });

vsashyn

Here's how you could create custom error classes in Node.js using latest ES6 / ES2015 syntax.

I've tried to make it as lean and unobtrusive as possible.

Defining our own base class for errors

errors/AppError.js

vsashyn

// cancelable promise
// originaly by @istarkov

const makeCancelable = (promise) => {
  let hasCanceled_ = false;

  const wrappedPromise = new Promise((resolve, reject) => {
    promise.then((val) =>
      hasCanceled_ ? reject({isCanceled: true}) : resolve(val),
      error => console.warn

vsashyn

const fs = require('fs')
const path = require('path')
const os = require('os')

const walk = function (dir, done) {
  let results = []
  fs.readdir(dir, function (err, list) {
    if (err) return done(err)
    let pending = list.length
    if (!pending) return done(null, results)

vsashyn

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

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// === Arrays

var [a, b] = [1, 2];
console.log(a, b);
//=> 1 2


// Use from functions, only select from pattern
var foo = () => [1, 2, 3];

vsashyn

const fs = require('fs');

fs.readFile('eslintlog.json', 'utf8', (err, data) => {
  if (err) throw err;

  let parsed = JSON.parse(data);

  grabWarnings(parsed)
    .forEach(generateCmd);
});