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Haskell Assignment Solution

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Welcome to learn Haskell for Great Good! If you are reading this, chances are you want to learn Haskell. Well, you have come to the right place, but let's talk about this tutorial first.

I decided to write it because I wanted to strengthen my knowledge of Haskell and because I thought that I can help new people learn Haskell from my perspective. There are some tutorials on Haskell floating around the internet. When I was starting at Haskell, I did not learn from just one resource. The way I learned it, he was reading many different tutorials and articles because everyone told in some did differently than the other. By going through many resources, I could keep the pieces together and all this just fell into place. So it's an attempt to add another useful resource for learning Haskell, so you have a great chance to find someone you like.

This tutorial is intended for those who have experience in compulsory programming languages ​​(C, C ++, Java, Python ...) but not programmed in a functional language before (Haskell, ML, Orem ...) has been done. Although I bet that even if you do not have any important programming experience, then a smart person like you will be able to follow and learn Haskell.

Channel # Haskell on for node Network is a great place to ask questions if you are stuck. People are very good, patient and new people understand

I finally failed to learn Haskell about 2 times before catching it because it all looked very strange to me and I did not find it. But once it was "click" and after finishing that initial hurdle, it was very smooth sailing. I think that what I am trying to say is: Haskell is very good and if you are interested in programming then you really should learn it, even if it seems strange first. Learning Haskell is like learning the first time program - its fun! This forces you to think differently, which brings us to the next section...

So what's Haskell?

Haskell is a fully functional programming language. In compulsory languages, you get things by giving a sequence of tasks to the computer and then it executes them. While executing them, this state can change. For example, you set the variable to one to 5 and then do some stuff and then set it to something else. Sometimes you have control flow structures to perform certain actions. In fully functional programming, you do not tell what the computer to do in this way is, but you tell it which items are there. The number of factorial all numbers of any number is from 1 to that number, the sum of the numbers list is the sum of the first numbers and all other numbers, and so on. You express it as functions. You can not set any variable to anything else and then set it to something else later. If you say that is 5, then you cannot say that it is something else later you just said that this was 5. What kind of liars are you So in fully functional languages, there is no side effect of a function. The only thing a function can do is to calculate something and return it as a result. First of all, it seems very limited but in fact there are some very good results: If a function is called twice with the same parameter, then it guarantees returning the same result. It is called referred transparency and not only allows it the compiler, to make a reason about the behavior of the program, but it allows you to easily cut (and even prove) that a task is correct and then combines simple tasks together to create more complex tasks Does.

Haskell is lazy. This means that, unless specifically told otherwise, Haskell will not execute the functions and will not count things until you are actually forced to show results. It goes well with the referenced transparency and it allows you to think about programs as a series of changes on the data. It also allows cool things such as infinite data structures. Suppose you have an unchanging list of numbers as = [1, 2, 3, 4, 5, 6, 7, 8] and a function is double MM, which multiplies each element by 2 and then gives a new list is. If we wanted our list to multiply by 8 in compulsory language and did double (double (double (as)), It probably passes through the list once and makes a copy and then returns it back. Then it will pass through the list twice and return the results. In a lingering language, without calling for the inventory to show you the double without calling the result, you end up in the type of program "yes yeah, I'll do it later!” But once you want to see the results, the first double made tells the other that he wants the result, now! Second One says that the third and third person reluctantly gives a doubly 1, which is 2. The second person receives it and gives 4 to the first. The first person sees it and tells you that the first element is 8. So it only goes through the list and only when you need it. In this way, when you want something from linguistic language, you can only take some initial data and change it efficiently and change it so that it looks like what you want in the end.

Haskell is typed steadily. When you compile your program, the compiler knows which piece of code is a number, which is a string and so on. This means that many possible errors are caught at compile time. If you try to add a number and a string together, the compiler will glow over you. Haskell uses a very good type of system, in which the type is estimated. This means that you do not have to label it clearly with each type of code in one type because the type system wisely can understand a lot about it. If you say a = 5 + 4, then you do not have to tell Haskell that there is a number, it can understand it itself. Type estimation also allows your code to be more common. If the function you made consists of two parameters and join them together and you do not explicitly tell their type, then the function will work on any two parameters that act as numbers.

Haskell is elegant and concise. Since it uses very high level concepts, the Haskell programs are usually smaller than their compulsory counterparts. And it is easy to keep small programs for a long time and have fewer bugs.Haskell was created by some really smart people (with PhD). Work on Haskell began in 1987 when a committee of researchers found it to prepare a kick-ass language. Haskell Report was published in 2003, which defines a stable version of the language.

What you need to dive in

A text editor and Haskell compiler you probably have your favorite text editor installed, so we will not waste time on it. For the purposes of this tutorial, we will use GHC; the most widely used Haskell Compiler The best way to start is to download a mobile platform, which basically includes Haskell with battery.

GHC can take a Haskell script (they usually have a .has extension) and compile it but there is also an interactive mode that allows you to interactively interact with the script. Interactive way you can make functions calls from those scripts you load and the results are displayed immediately. Every time you make a change to learn and then run a program from the prompt, the compilation is much easier and faster. Interactive the mode is called by typing in chic at your prompt. If you have defined some functions in the file, say myfunctions.hs, you load these functions by typing: l my functions and then you can play with them, provided myfunctions.hs is in the same folder in which chic If you change the .has script, then just run: l do my functions again or: r, which is equivalent because it reloads the current script. Normal workflow for me while playing around in the stuff is defining some functions in a .has file, loading it and messing with them, and then changing the .has file, reloading it Used to be. This is what we will do here.



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