paulfranco

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.

Source: tutorialspoint.com

lopspower

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

joepie91

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

• A Russian translation of this article can be found here, contributed by Timur Demin.
• A Turkish translation can be found here, contributed by agyild.
• There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

jhurliman

/*
 * base64.js: An extremely simple implementation of base64 encoding / decoding using node.js Buffers
 *
 * (C) 2010, Nodejitsu Inc.
 * (C) 2011, Cull TV, Inc.
 *
 */

var base64 = exports;

joepie91

ES Modules are terrible, actually

This post was adapted from an earlier Twitter thread.

It's incredible how many collective developer hours have been wasted on pushing through the turd that is ES Modules (often mistakenly called "ES6 Modules"). Causing a big ecosystem divide and massive tooling support issues, for... well, no reason, really. There are no actual advantages to it. At all.

It looks shiny and new and some libraries use it in their documentation without any explanation, so people assume that it's the new thing that must be used. And then I end up having to explain to them why, unlike CommonJS, it doesn't actually work everywhere yet, and may never do so. For example, you can't import ESM modules from a CommonJS file! (Update: I've released a module that works around this issue.)

And then there's Rollup, which apparently requires ESM to be u

jedi4ever

Clustering: The basics

The trick? pass the file descriptor from a parent process and have the server.listen reuse that descriptor. So multiprocess in their own memory space (but with ENV shared usually)

It does not balance, it leaves it to the kernel.

In the last nodejs > 0.8 there is a cluster module (functional although marked experimental)

• http://nodejs.org/api/cluster.html
• Simple cluster example:

kolosovsky

The computation of the axis-aligned bounding box (AABB) in JavaScript

Polygon (rectangle, triangle, etc.)

Live demo https://jsfiddle.net/Kolosovsky/tdqv6pk2/

let points = [
	{ x: 125, y: 50 },
	{ x: 250, y: 65 },

hsablonniere

scrollIntoViewIfNeeded 4 everyone!!!

This gist provides a simple JavaScript implementation of the non-standard WebKit method scrollIntoViewIfNeeded that can be called on DOM elements.

Usage

Just use the code in index.js in your app or website. You can see usage in the test page test.html.

The parent element will only scroll if the element being called is out of the view. The boolean can force the element to be centered in the scrolling area.

hugosp

var express = require('express');
var expressWs = require('express-ws');
var expressWs = expressWs(express());
var app = expressWs.app;

app.use(express.static('public'));

var aWss = expressWs.getWss('/');

app.ws('/', function(ws, req) {

diolavr

function rus_to_latin ( str ) {
    
    var ru = {
        'а': 'a', 'б': 'b', 'в': 'v', 'г': 'g', 'д': 'd', 
        'е': 'e', 'ё': 'e', 'ж': 'j', 'з': 'z', 'и': 'i', 
        'к': 'k', 'л': 'l', 'м': 'm', 'н': 'n', 'о': 'o', 
        'п': 'p', 'р': 'r', 'с': 's', 'т': 't', 'у': 'u', 
        'ф': 'f', 'х': 'h', 'ц': 'c', 'ч': 'ch', 'ш': 'sh', 
        'щ': 'shch', 'ы': 'y', 'э': 'e', 'ю': 'u', 'я': 'ya'
    }, n_str = [];