There is a good chance that you are already using promises in your code – they are everywhere now. Have you ever considered how they work, though? I this article I want to explain why they are a good thing and what problems do they solve. I will do that while implementing quite a ludicrous sorting […]
Variable values have certain types. In fact, you can cast a value of one type to the other. If you do it explicitly, it is type casting (also called explicit coercion). If it happens in the background when you are trying to perform an operation on types that do not match, it is called coercion (sometimes referred to […]
You can think of a scope as of a wrapper that contains all the variables and a reference to the parent scope. What does that mean and what should we watch out for when dealing with it? Let’s find out! How scopes work When we try to access a variable in our code, the interpreter […]
One of the great things that ES6 brought us are classes. We need to remember though, that all the work is done by prototypes under the hood. It means that ES6 classes act just as syntactic sugar. In this article, I will walk you through the basics of the prototypes, so that you can better grasp […]
Undefined is one of the reasons for confusion and can get under the skin of a developer. But what is it exactly? Definition of undefined It is a value undefined value primitive value used when a variable has not been assigned a value Undefined is a special value that lets the programmer know that a variable […]
Have you ever taken a minute to consider how does a css parser handles the priority of all of the css declarations? This might be just the right moment! This knowledge will help you avoid many problems along the way, such as using the css !important rule. C stands for Cascading The first step in CSS […]
If you ever programmed in another Object Oriented language, “this” keyword in JavaScript might be very confusing for you. Bear with me, I will show you some Java code.
1 2 3 4 5 6 7 8 9 | public class Point { int x; int y; public Point(int x, int y){ this.x = x; this.y = y; } } |
Here, the “this” keyword is a reference to the current object, so calling
1 | this.x = x; |
in the constructor will assign a value to the x property of an […]
WebAssembly (wasm) is an emerging standard – the future is coming. The support in browsers is already growing – what we still need is lowering the entry barrier for us, developers. Luckily, that is soon to be changed. I want to present you with a quick overview of something, that quite struck me – compiling […]
There are two types of clones in JavaScript: deep, and shallow. To fully understand the difference, we need to dive deeper into how the interpreter treats different types of variables. Let’s go! Primitive types null undefined boolean number string symbol These are the types that are immutable. Some of you might be surprised – we […]
First things first: JavaScript code being asynchronous does not implicate it running in more than one thread. So what does asynchronous mean exactly? Imagine making an Ajax request to fetch some data from the server. You won’t get a response immediately – you need to wait a little bit for the server to respond. What […]