glebcha

#!/bin/bash

# Enhanced version of https://stackoverflow.com/a/52371112/1835055

DIRNAME=${1:-.}
cd $DIRNAME

FILES=$(mktemp)
PACKAGES=$(mktemp)

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const modifier = type => item => Object.prototype.toString.call(item) === `[object ${type}]`;

const checkTypes = ['String', 'Function', 'Number', 'Boolean', 'Object', 'Symbol'];

const is = checkTypes.reduce((checkers, type) => ({ ...checkers, [type]: modifier(type) }), {});

is.Function(null)

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function bulkRequest(urls) {
    const promises = urls.reduce((result, url) => {
	const isValidUrl = Object.prototype.toString.call(url) === '[object String]';
	    
        if (isValidUrl) {
            result.push(
                fetch(url)
                    .catch(({ message }) => console.warn(`Bulk Request: ${ message }`))
                    .then(response => ({ [url]: response }))
            )

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function structuralClone(obj) {
  return new Promise(resolve => {
    const {port1, port2} = new MessageChannel();
    port2.onmessage = ev => resolve(ev.data);
    port1.postMessage(obj);
  });
}

var obj = {a: 1, b: {
    c: b

glebcha

@kangax's ES6 quiz, explained

@kangax created a new interesting quiz, this time devoted to ES6 (aka ES2015). I found this quiz very interesting and quite hard (made myself 3 mistakes on first pass).

Here we go with the explanations:

Question 1:

(function(x, f = () => x) {

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const EXTENSION_TYPE = {
    0x01: 'PlainText',
    0xF9: 'GraphicControl',
    0xFE: 'Comment',
    0xFF: 'Application'
};

/**
 * Returns total length of data blocks sequence
 *

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// Find summ of all elements in array => result: 32
var multiArr = [1, '2x', ['3', ['x2', ['10', '10'], '5'], '1x']];

function summ(arr, result) {
	var result = result || 0;

	for (var i = 0; i < arr.length; i++) {
		var number = arr[i];
		var notNumber = isNaN(parseInt(number));
		var isArray = Object.prototype.toString.call(number) === '[object Array]';

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function Node(data) {
	this.data = data;
	this.next = null;
	this.prev = null;
}

function linkedList() {
	this.head = null;
	this.size = 0; 
}

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Here is my recipe how to speed up WebStorm:

Go to Preferences and do next:
Appearance & Behaviour > System Settings > Updates: disable auto update
Appearance & Behaviour > System Settings > Using Statistics: Uncheck allowing sending data
Editor > Live Templates: disable all, leave only what you are really use
Editor > Emmet: disable all emmets
Editor > Intentions: I leave only: CSS, Declaration, JavaScript and Language Injection
Plugins: leave only next (* - can be also disabled in case don't need them):
CoffeeScript *

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//Iterate through object
const obj = {
  foo: 'bar',
  comes: 'is',
  from: 'object'
};
for(let key in obj) {
  if(obj.hasOwnProperty(key)) {
    let valueOfKey = obj[key];
    console.log('%s: %s', key, valueOfKey);