Why does Node.js exists? — Thread-based networking is relatively inefficient and very difficult to use. Furthermore, users of Node are free from worries of dead-locking the process, since there are no locks. Almost no function in Node directly performs I/O, so the process never blocks.

What is Node.js?

Blocking is when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes. This happens because the event loop is unable to continue running JavaScript while a blocking operation is occurring.

Blocking methods execute synchronously and non-blocking methods execute asynchronously.

JavaScript execution in Node.js is single threaded, so concurrency refers to the event loop's capacity to execute JavaScript callback functions after completing other work. Any code that is expected to run in a concurrent manner must allow the event loop to continue running as non-JavaScript operations, like I/O.

Node is similar in design to, and influenced by, systems like Ruby's Event Machine or Python's Twisted. Node takes the event model a bit further. It presents an event loop as a runtime construct instead of as a library.

In Node there is no such start-the-event-loop call. Node simply enters the event loop after executing the input script. Node exits the event loop when there are no more callbacks to perform. This behavior is like browser JavaScript

The event loop is what allows Node.js to perform non-blocking I/O operations — despite the fact that JavaScript is single-threaded — by offloading operations to the system kernel whenever possible.

Since most modern kernels are multi-threaded, they can handle multiple operations executing in the background. When one of these operations completes, the kernel tells Node.js so that the appropriate callback may be added to the poll queue to eventually be executed.

When Node.js starts, it initializes the event loop, processes the provided input script (or drops into the REPL) which may make async API calls, schedule timers, or call process.nextTick(), then begins processing the event loop.

These are the phases of the event loop. Each phase has his own queue. timers pending callbacks idle, prepare poll <- incoming: connections, data etc. check close callbacks

Each phase has a FIFO queue of callbacks to execute.

While each phase is special in its own way, generally, when the event loop enters a given phase, it will perform any operations specific to that phase, then execute callbacks in that phase's queue until the queue has been exhausted or the maximum number of callbacks has executed

12:33 > This diagram looks basically identical for node, instead of web APIs we have C++ APIs and the threading is being hidden from you by C++

Just because Node is designed without threads, doesn't mean you cannot take advantage of multiple cores in your environment. Child processes can be spawned by using our child_process.fork() API

V8 The V8 library provides Node.js with a JavaScript engine, which Node.js controls via the V8 C++ API. V8 is maintained by Google, for use in Chrome.

V8 is Google’s open source high-performance JavaScript and WebAssembly engine, written in C++. It is used in Google Chrome, the open source browser from Google, and in Node.js, among others.

V8 implements ECMAScript and WebAssembly. Can run standalone, or can be embedded into any C++ application

Libuv, a C library that is used to abstract non-blocking I/O operations to a consistent interface across all supported platforms. It provides mechanisms to handle file system, DNS, network, child processes, pipes, signal handling, polling and streaming.

To me, it's so much about doing your homework, going into a situation, getting to know the subject, making them feel comfortable, getting intimate access, getting access to all different aspects of people's lives so that I am essentially telling an entire story and not just a single image.

Just several years ago, Shaykh Kabbani, who is the head of the Islamic Supreme Council of America, when he was speaking at the State Department, said that more than 80 percent of the mosques were controlled by extremists. And from all I've seen over the last four or five years, the situation has even gotten worse.

Our country has been the leading provider of humanitarian aid for refugees.

I shudder at the image they would piece together.

Muslims know that Islam clashes with Western Civilization. They make no bones about choosing Islam over their new home country, like the Syrians in Germany, or the Somali at Ohio State University. They are very open and honest on polls, because they know they have nothing to fear from the governments that welcomed them with open arms.

I was a teacher for a long time. I taught at a community college: voice, theory, humanities. And nowadays, music education is a dying thing. Funding is being cut more and more and more.

Financial institutions like to call what they do trading. Let's be honest. It's not trading; it's betting.

Just think about it: what in the name of God would Alabama be without the University of Alabama? What would Oklahoma be without the University of Oklahoma? Nothing.

Art is an investigation.

American books reflect our common heritage with many other nations and their influence upon our culture. The influences are endless, linking us with the rest of the world. Thus, they are good ambassadors for us.

Ignorance is a horrible thing. But arrogance, the belief that knowing a little more than the ignorant makes you wise, is more horrible still.

When I write fiction, I never try to deliver a message; I just want to tell a story. But I admit that I want the story to be memorable and the characters to touch the reader's heart.

Of course great hotels have always been social ideas flawless mirrors to the particular societies they service.

Everybody has ideas. The vital question is, what do you do with them? My rock musician sons shape their ideas into music. My sister takes her ideas and fashions them into poems. My brother uses his ideas to help him understand science. I take my ideas and turn them into stories.

Family is a life jacket in the stormy sea of life.

I was fairly solitary. I didn't like structured learning. People didn't seem to be my cup of tea.

I was at college studying psychology, philosophy, textiles and drama. But because I wasn't one of those all-singing, all-dancing stage-school kids, I just assumed I'd never become an actor.

I have a nice boat that I got a couple of years ago that's a Skeeter brand that's 20-foot, center-console. I have it set up for saltwater and for fresh water, so it's been a nice boat.

Some days are just bad days thats all. You have to experience sadness to know happiness and I remind myself that not every day is going to be a good day thats just the way it is

Chemically speaking chocolate really is the worlds perfect food.

In God we Believe And god believes in love.

I'm not the best person to analyze any kind of evolution in my work, but I do feel like it's been an ongoing struggle to basically teach myself how to tell the kinds of stories that interest me in comics form.

The sun as the expression of old world energy is torn down from the heavens by modern man, who by virtue of his technological superiority creates his own energy source.

I used to like Barbra Streisand films. It was 'Funny Girl' that really turned me on, in a sense, to acting. I remember it specifically being a rainy Saturday afternoon. I couldn't play football, so I stayed in, and I watched 'Funny Girl.'