![]() ![]() We could have incorporated Algebraic Data Types from ramda-fantasy.It is clear that we could have gone more functional if we wanted to. Now you can see what I meant about our game state being impure, every loop we get the new state and update our mutable state inside our index. y != 0 Įnter fullscreen mode Exit fullscreen mode index.js const setupInput = () => : state ) // Checks that the snake always moves forward and // cannot switch to the opposite direction const isValidMove = ( direction, move ) => direction. So following that approach I am gonna be very explicit about which parts of the game produce side effects and which ones don't. ![]() JavaScript, on the other hand, doesn't have these tools, they can be added by using libraries like Ramda Fantasy, but in our case, we are gonna use an approach called Functional Core Imperative Shell, which basically says that we can treat our code as mostly functional by keeping everything pure in one place and everything that is not pure near to the boundaries of our software, if you want to read more about it you can check the original blog post here Pure functional programming languages come with certain tools that help us handle this in an elegant way. The internal state of the game that needs to be updated (the position of the snake, apple, etc).The output of the game (what you see on the screen).In our case, we have 2 types of side effects: If side effects would be avoided there would be no proof that the program actually runs. Today we are gonna extend that and complete the game, let us start by getting rid of the ugly parts.Įvery software needs to produce side effects. In our previous article, we end up having the UI ready and a small model of our snake. If you haven't read the previous article you can do it here. If that is the case then you are in luck because today we are gonna finish our beloved Snake Game written in functional JavaScript. Hey guys, I hope you are doing well and learning some new skills while quarantined. If you are interested in reading this article in Spanish, check out my blog The Developer's Dungeon
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