Let's talk about RxJS - another concept that has recently established itself as an important part of modern JavaScript. In JavaScript applications you sometimes have to deal with streams of asynchronous events. For example, events could be produced by the user (button clicks, key presses) or pushed by a backend server (via web sockets or some other mechanism). read more

It's time to see a practical application of immutability. You will now learn about Redux - an amazing concept which will change how you think about building applications. read more

Have you noticed the abundance of tutorials, introductions and guides devoted to post-ES6 JavaScript? read more

In the previous post we saw some techniques that can help us implement immutability. However, none of them feel very natural in plain, vanilla JavaScript. It doesn't feel like the language and the standard library have been designed with immutability in mind. It's not surprising given that one of the language's main purposes was to mutate DOM (the Document Object Model). read more

In previous posts we've discussed how to deal with arrays in a functional way. We've learned about an important concept in Functional Programming: higher order functions. Let's now tackle another very important concept: immutability. read more

With this post we will finalize the part of this course devoted to array operations Vanilla JavaScript provides us with some higher order functions (such as forEach , filter , map and reduce). However, there are actually many more such functions in the world of functional programming. Lodash is a library which extends your arsenal of higher order functions. Let’s have a look at how to use it in practice. read more

In the previous post we’ve looked at three very useful functions: forEach, map and filter. Let’s now look at reduce  – a bit more complicated function which shows the real power of functional programming. read more