This course will take you through the basic tour of basic Algebra and Theorems in mathematics from the view of Haskell programming.
Haskell is a purely functional language. There is very little you can learn on the internet by just searching for Haskell. Unlike any other programming languages, you will find much less tutorials or any community help when compared to languages like Java, C or Python.
The main reason being, Haskell programming is a bit weird and tough to learn, but hey, it's a functional language after all. What else do you expect? So, if you want to learn Haskell programming from just one source, then probably it will be tough for you to understand the whole Haskell programming concept.
Through this Haskell Course you will learn that, one thing that makes Haskell tough is the strong static typing and the non-strict semantics which actually if you understand properly are quite helpful.
The above is just a pseudo code for calculating the sum from 1 to 10. Thus I have used here x as one in the start, then increase the value by one every time using a loop till x is less than 10.
Now, this is what most programming languages do. But you can't do the same in Haskell Programming. Remember I said that Haskell is purely Math oriented. So, for example when do a math, we cannot assume the identity of a variable and then change it.
If x = 10 in math, it will remain 10, it won't change until that specific problem ends. To make it more clearer, if you call an animal as chicken, you cannot later say that it is a horse.
Because no matter what, it will still be a chicken. That is the same case with Haskell. In functional languages like Haskell, a function just does the job of solving a problem and it doesn't matter to the function as to whether the rest of the code is proper or not.
This makes it easy to bifurcate and debug the code when needed since if one piece of code is right, it will stay right no matter what, unlike other programming languages where you would have to do some 'modificios' in the whole code to just suit your requirement.
Haskell is all about pure scientific logic. Haskell follows the pattern of referential transparency, which means if a function with absolute same parameters is called twice; it will still give the same result.
This is actually very helpful than rather being limiting in one sense. The reason being, in other programming languages you will have to take an educated guess as to what the result will be, but in the case of Haskell, it's extremely easy to deduce the result because of the referential transparency.
Haskell again, is an Open Source Language and it is all about expressions. Every expression here has a specific type which is identified at the compile time. If the type in the compiled application doesn't match up with that of the interpreter's, then it will get rejected by the compiler.
Through this Haskell Course you will learn that, every function in Haskell Programming is based on Mathematics. Most of the applications and problems are based on the To-prove theorem. In other languages, where you find the statements, you won't find the same in Haskell.
Through this Haskell Course you will learn that,, Haskell includes only and only expressions. Haskell deals well with concurrency and garbage collection. It is light-weight and fast as well. There are more than 5000 packages freely available online which are totally open source.
Through this Haskell Course you will learn that,, Haskell programming is more based on logic and structure. Unlike other programming languages like say Ruby or Perl, Haskell helps to write properly indented code which makes it simpler and easier to read and cleaner to write.
This Haskell Course will be using the GHCI compiler and notepad++ for solving problems. This Haskell Course is not for absolute beginners. This Haskell Course will take you through the basics of Haskell.
Through this Haskell Course you will learn that, already having knowledge about the terminologies of a programming language might prove helpful. Haskell offers lazy style computing. Though Haskell programming is more of a statically typed programming, this course will also pick up examples on dynamically typed codes.
This Haskell Course will cover the basic theorems, algebra, sets and unions in Mathematics. The Haskell version used is v7.10.2-a and will be run in a windows environment.
Through this Haskell Course you will learn that, Haskell programs require lots of modules to be imported, some which are not easily available online. Most of these modules since are hard to find, the codes for them will be covered in the Notepad++ instead of executing it directly in the GHCI compiler.
Haskell Course doesn't have a specific pre-requisite as of such. Knowing basic terminologies of programming languages such as functions, arguments, statements and conditions, will help you get around and in getting started with Haskell.
Though C and Java are way too different from Haskell, knowing them might help in getting used to the concurrencies and garbage collection. Haskell has its own way of doing things, and when I say own way I mean the lazy way.
If you have any experience in programming previously, then you may find a lot of shortcut ways taken in Haskell programming.
And these so called 'shortcuts' are not just shortcuts but the actual way of coding in Haskell. Another specific pre-requisite for learning Haskell might be to have a good understanding of Algebra and Geometry in Math.
They will help you to get around understanding Haskell theorems in a much easier manner.
Through this Haskell Course you will learn that, one thing worth making note about is that the default GHCi comes pre-loaded with a bunch of packages. To check the packages installed, one can simply do it in the interpreter by typing $ ghc-pkg list.
However, one can even install the packages separately by using the Cabal. Cabal is a system infrastructure for configuring and building packages and libraries for Haskell.
Before installing a package, one can check its configuration with the Cabal. Cabal specifies what the package is, what it does and what are its dependencies. When you check the list of installed packages, some packages may be visible in parentheses or in other colour than the normal ones due to its hidden rule by default.
Using command line flags, one can change the visibility of packages to either exposed or hidden. By default, GHC only allows to import the exposed packages. If you try to import any hidden package, the compiler will return an error message. Every application in Haskell must define a main inside the module in every main package.
Whenever you are trying to import a module, make sure you have checked the hidden packages for the modules with the same name or config, else you may end up having multiple modules which do the same thing and they may overlap each other.
In this Haskell Course, you will learn that, every package which is installed has a UID i.e. the unique identifier. This unique ID stands for the package ID so as to differentiate it from the rest.
One can make use of the $ ghc-pkg list -v to list all the installed package's ID. The main reason for this to be present to help solve any errors caused due to re-installation of packages which are installed without recompiling it dependencies.
Since the package ID is different, and if dependencies are not re-installed along with the main package, the package may have broken paths and symbolic links. One would require to recompile the file path of the package which caused the packages the break.
Besides, the $ ghc-pkg tool is very helpful in modifying package databases. One can also try to build a package from source if required. This is however not recommended since it would require a lot of configuration and is a complicated task to handle.
Who should learn this Haskell Course?
Anyone interested in exploring deep mathematics in programming can take up this Haskell Course.
Animation and Graphic developers can take up this Haskell Course.
People wanting to learn Encryption and Cryptography can take up this Haskell Course.
People wanting to write pure functional algorithms for security and pen testing can take up this Haskell Course.
Advanced Mathematics and proving general scientific theorems can take up this Haskell Course.
Now, I can go on and on, but this list may seem a bit odd. Let me explain it to you in this way. A person knowing his or her way to work around Haskell is the hallmark of a Genius. C and Java are tough to learn, but let me tell you frankly Haskell is complicated.
The main reason behind this is because Haskell is purely based on logic, which sometimes seems to lack in languages like Python or Ruby. For example, a lot of things or I would prefer the official term 'magic' happens in Python. If you want to do something, just import it and it happens.
That is not the case with Haskell. Everything here needs to be done in a proper manner. Through this Haskell Course you will learn that, Haskell bends your mind to think in such a way that normal programmers don't tend to think towards. Knowing Haskell programming helps to even write brilliant pieces of code in other languages as well.
As a matter of fact, Haskell programming can be a rock solid foundation for a programmer as the first learning language. Let me give an example. In usual programming, we use loops and conditions.
But in Haskell, we have to generally find some other viable options such as the maps, folds and filters to get around the problem. This helps people to solve a problem in more than just one way and it opens up the various approaches one tends to have towards a problem.
This makes you a more reasonable programmer and to switch viewing angles when needed towards solving a complicated problem. I often find myself solving problems of C and C++ in Haskell, which if I would have stuck with C or Java wouldn't have been able to solve with.
Why learn this Haskell Course?
Most of the answers to this question as to why to learn this course have already been answered previously. But still let me get this a bit clearer. Haskell is prefers lazy evaluation for solving problems. Let me give you a simple example to differentiate between Haskell and C.
Now the above codes are written to copy the contents of one file and write it to the other file. You can easily see the difference between the amounts of time one may require to write both of the codes since the code of the Haskell is pretty up to the point and short as well.
Okay, let's say we leave the topic of writing smaller codes since even a python file can even do that. Then how is this different from that of a python? Now the answer to this as I said previously is lazy evaluation.
In Python or C, the whole program will be loaded into the memory and then it will get executed. But that's not the case with Haskell programming. In Haskell everything is lazy here. I would more prefer to call it smart rather than lazy, but since lazy is the official term, be it as it is.
My point being, Haskell won't read the whole file unless it needs to. So, Haskell here reads the first block, and then copies it, then the second block and so on. So, this makes it extremely proficient in terms of performance.
Even if you want to delete the output file, a python would first read the whole file and then delete it, whereas a Haskell program would straight away delete it without loading it into the memory.
Learning Haskell leads to better design structure and reduces the chances of errors and bugs due to logical programming. The codes written are quiet compact similar to that of Python, but at the same time as efficient as that C such as being fast.
And Haskell functions have no side effects since one function does a job only within itself due to referential transparency.
What really sets Haskell different from any other languages is its logical reasoning and if brainstorming is what you are looking for, then Haskell programming it is that you need to learn.
Now if you are still reading this article, this means you haven't given out hope yet and you also know that you cannot use Haskell to write automated codes for your daily jobs on the go, which you can for Python, Bash or Ruby. But Haskell was not meant for that.
Haskell is used a lot in industry, but not as much as C, C++ or Java. But let's take a look as to what Haskell Course can actually be used for by the industry in the real world.
In this Haskell Course, you will learn that, due to its logical reasoning, Haskell programming is most often used in banking sectors for calculating out huge investment tasks.
Top world banks such as Barclays Capital and Tsuru Capital are good examples of that. Now to inform you as programs, a lot of programs such as the Knit application which lets you to learn C code to build new programs and the linkcheck which is a local network monitoring application for Linux have all been written in Haskell. One can find more interesting examples at https://wiki.haskell.org/Haskell_in_practice where they have stated about more than 50 places where Haskell programming has been used.
I don't think there is anything else to get you started with Haskell programming. Learning Haskell requires time, effort and dedication.
I would rather say it's much easier to switch from C to Python and vice versa, than learning Haskell from scratch.
But once you learn the way to code in Haskell, it would actually widen your way of thinking to solve a specific problem, not only in Haskell, but also in any other language.
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