So, you finally have an insight into the basic JavaScript concepts and want to take your skills to the next level. Well, this is among the best choices you can ever make in your career. After all, JavaScript has been the most used programming language for years now. It’s popularity surpasses even Java, Python, HTML, and CSS.
Taking the initiative to master advanced JavaScript will allow you to build more complex websites without frameworks. Moreover, whenever you decide what framework to learn, it’ll be much easier for you. Here is a quick breakdown of 12 terms every JavaScript developer needs to know.
JavaScript Closures
If you’ve done a bit of research here and there, you probably already know that a closure is an advanced concept involving a function and any other data the function can access. You can refer to it as a function that leverages variables from the outer lexical landscape. The interpreter considers any arguments you pass to functions from the global space.
In the event that a function only counts on its internal values and parameters, it’s not considered a closure. Keep in mind that functions can access values from other external functions considered closures.
JavaScript Inheritances
There’s a good chance you’ve probably heard about the term prototypal inheritance. The Prototype Chain explains that all objects have a private property called ‘{Prototype}’ that allows objects to inherit properties from each other. InJavaScript, objects also inherit methods from other objects.
Thanks to this, some data types like Strings, Numbers, and Arrays inherit valuable methods. While searching for a property or a method, then Interpreter will try to find a matching name on the object. If unable, it’ll also seek the object’s property and even the property of the property.
JavaScript Callback Functions
JavaScript Callback Functions are ideal for handling asynchronous operations. The interpreter will give you the results of every function in the order they appear, starting from the top of the file and going downwards. But in the event that a function takes a long time to complete its task, the next one will execute first.
That might be different from what you expected when you wrote the functions. You can quickly handle this issue by passing the first function as a parameter to the next one. And that’s what we refer to as a callback function!
