Mittwoch, 18. Mai, 2016

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Delving into Node.js and Express web framework 22 JavaScript code to native machine code before executing it. It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. Event driven Saying that something is event-driven means that you can register some function to some event and that function will then be executed once the event is triggered. A simple example in JavaScript/HTML follows: 1 2 3 4 5 6 7 8 9 10 11 var myButton = document.getElementById('myButton'); 12 13 function outputText(){ 14 var myInputText = document.getElementById('myInput').value; 15 alert(myInputText); 16 } 17 18 myButton.addEventListener('click', outputText); 19 20 21 Just copy/paste this code in an events.html file and open it up in your browser (for your convenience, here’s the jsFiddle link of this example⁶¹). If you enter something in the input field and click the button, you will get the alert with the text you entered in the input field. So, in this simple example we’ve registered a function outputText to a buttons’ (with an id of myButton) click event. Web browser manages a single thread to run the entire JavaScript code using an inner loop a.k.a the event loop, which is basically a single-threaded loop that the browser runs infinitely. When some event gets emitted, the browser adds it to its event queue. The event loop then grabs the next event from the event queue in order to execute the event handlers registered to that event. After all of ⁶¹http://jsfiddle.net/Hitman666/c9buyjnh/
Delving into Node.js and Express web framework 23 the event handlers are executed, the loop grabs the next event from the queue, executes its handlers, grabs the next event from the queue, and you get the picture, right? Well, if you’re like InEnglishPlease then please invest the next 20 minutes in this video by Philip Roberts on “What the heck is the event loop anyway?” and I promise you’ll thank me later: https://www.youtube.com/watch?v=8aGhZQkoFbQ⁶² Wait, what do you mean 20 minutes, if the video clearly states it’s 26:52 mins long!? Well, since today we’re all about time hacking, you can listen at the speed of 1.25, but I’m sure you already know this, right? ;) And yeah, here’s a nifty Google search which calculates how much time you’ve saved⁶³ by listening at this speed. ⁶²https://www.youtube.com/watch?v=8aGhZQkoFbQ ⁶³https://www.google.com/search?num=50&espv=2&q=%2826minutes+and+52+seconds%29+minus+%2826minutes+and+52+seconds+ multiplied+by+0.25%29&oq=%2826minutes+and+52+seconds%29+minus+%2826minutes+and+52+seconds+multiplied+by+0.25%29
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Mittwoch, 18. Mai, 2016

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