How to learn Haskell

knowledge of the basics

Read Learn You a Haskell for Great Good!hich is advised. In my opinion, of the current Chinese tutorials, this book is the greatest suited for beginners positivity.

Recommended Learning Progress

1. Study Chapters 1 and 2 to understand the fundamentals of writing Haskell code, how to run Haskell code in ghci, and how to run Haskell code in a text file. The challenge in learning these two chapters is comprehending the language's fundamental grammar. You can move on to the following part once you are comfortable with the grammar's fundamental structure.
2. Read Chapter 3: Type Classes and Types (typeclasses). This section mostly explains Haskell's type representation mechanism. Haskell is a strongly typed programming language, as we are all aware, and types are significant in Haskell. You will have a basic understanding of type classes if you read this section. You can comprehend writing techniques like Eq A and Ord A in this section, and you will learn more about type classes later.
3. Study Chapters 4–7, which best explain Haskell's functional character, in order, paying particular attention to:

1. use of frequently used built-in features.
2. Type-Oriented Function Writing.
3. In writing function control structures, there are five approaches that are frequently used: pattern matching, guard, where, let, and case of.
4. recursion! You will see how easy recursion is in this case.
5. Here are higher-order functions and functional writing for various popular programming languages.

4. The IO operation of Haskell is described in Chapter 9, which can be learned depending on a person's needs and has little to do with the previous chapters.
5. The material that comes before Chapters 8 Functor and 10 employs functional thinking to resolve issues.
6. Next is the Haskell core notion, which includes Functor in Chapters 8, 11, 12, and 13. The relationship and distinctions between Functor, Applicative, and Monad are each introduced in turn in this section. Following reading this section, readers One could argue that it represents Haskell's fundamental ideas.
7. Reading the first seven chapters will be sufficient for anyone who only want to gain a basic understanding of functional grammar in Haskell. Each of the aforementioned sections can be thought of as a turning point, and every action bears fruit in abundance.
8. Codewars, where you may test your Haskell language skills and watch other experts to learn some fantastic operations, is the first to advocate that you practice Haskell code.
9. It might be best to read it along with Haskell: The Art of Functional Programming and Real Word Haskell if you want to be thorough.
10. Also make good use of the following tools, search engines, hackage, hoogle, github, haskell wiki, stack overflow and other websites, the most important haskell language report and ghc user guide.

In addition

1. The easiest IDE to use right now is haskell-language-server, which can help you accomplish twice as much work in half the time. Users of VSCode can look for it in the plug-in market and download it, while other users can install it on their own by following the instructions on the official website.
2. You must examine the real code implementation, step by step, for a variety of somewhat abstract concepts like Functor, Applicative, Monad, etc. Despite the fact that they are category theory notions, I believe that you only need to think of them as models when studying Haskell. How to comprehend these ideas and associated functions is covered in a lot of tutorials. In actuality, reading the code attentively is preferable to reading numerous tutorials.
3. Hope you can learn happily. After studying, you can acquire something that is beneficial to you and can be put to use.