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How to Install Haskell on Windows?

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5 min read
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Installing Haskell on Windows is relatively straightforward. Here's a step-by-step guide for installing Haskell on Windows:

  1. Visit the official Haskell website (https://www.haskell.org) and go to the downloads section.
  2. Look for the latest version of the Haskell Platform for Windows and click on the corresponding download link.
  3. Once the download is complete, run the installer file (usually a .exe file) to begin the installation process.
  4. The installer will guide you through the setup process. Click "Next" or "Continue" to proceed to the next step.
  5. You will be prompted to choose the components you want to install. By default, it installs the Haskell Compiler (GHC), the Haskell Cabal build tool, and additional libraries. You can also choose to install Haskell development tools and editors if you prefer.
  6. Specify the installation location where you want Haskell to be installed. The default location is usually fine, but you can choose a different directory if desired.
  7. After choosing the installation location, click "Next" to proceed.
  8. The installer will start extracting and installing the selected components. Wait for the installation process to complete.
  9. Once the installation is finished, you can optionally configure a system-wide package database. This allows multiple users on the computer to share installed Haskell packages. Click "Next" to proceed if you want to set it up, or you can skip this step by clicking "Cancel."
  10. Finally, you will see a confirmation screen indicating that Haskell has been successfully installed. Click "Finish" to complete the installation process.

After the installation, you can access the Haskell compiler (GHC) and build tools from the command prompt or terminal. You can also install additional Haskell packages using the Haskell package manager (Cabal) to expand the functionality of your Haskell environment.

That's it! You have now installed Haskell on your Windows system.

How to start GHCi (Haskell interactive mode) on Windows?

To start GHCi (Haskell interactive mode) on Windows, follow these steps:

  1. Install the Haskell Platform from the official website: https://www.haskell.org/platform/windows.html
  2. Open the Command Prompt or PowerShell on your Windows machine. You can do this by pressing the Windows key, typing "cmd" or "PowerShell," and selecting the appropriate option.
  3. In the Command Prompt or PowerShell, type "ghci" and press Enter. This command starts GHCi, and you should see the GHCi prompt, "Prelude>," indicating that GHCi is running and waiting for input.
  4. Congratulations! You have successfully started GHCi (Haskell interactive mode) on Windows. Now, you can enter Haskell expressions and interactively evaluate them at the GHCi prompt. For example, you can type "2 + 2" and press Enter to see the result: "4".

Note: If GHCi is not recognized as a command, you may need to add the GHCi executable's location to your system's PATH environment variable. The default installation location of GHCi is usually "C:\Program Files\Haskell\bin". You can add this location to the PATH variable by going to Control Panel -> System -> Advanced system settings -> Environment Variables, selecting the "Path" variable, and clicking "Edit" to add the GHCi executable location to the list of paths. Remember to separate the paths with semicolons (;).

What is GHC (Glasgow Haskell Compiler) and why is it needed for Haskell installation on Windows?

GHC (Glasgow Haskell Compiler) is the primary compiler for the Haskell programming language. It is responsible for translating Haskell source code into machine code that can be executed by a computer.

On Windows, GHC is needed for Haskell installation because it provides the core functionality required to develop and run Haskell programs. GHC includes not only the compiler but also the necessary runtime system and various libraries that are essential for building and executing Haskell programs on the Windows operating system.

In summary, GHC is required for Haskell installation on Windows because it is responsible for compiling and running Haskell programs on the platform, and provides the necessary tools and libraries for development in the Haskell language.

What is Cabal, and how does it relate to Haskell installation on Windows?

Cabal is a build system and package manager for the Haskell programming language. It provides a way to manage dependencies, build and install Haskell packages, and create and manage Haskell projects.

When installing Haskell on Windows, Cabal is usually included as part of the Haskell Platform, which is a collection of tools and libraries bundled together for a comprehensive Haskell development environment. The Haskell Platform provides an installer that sets up Cabal and other necessary tools for Haskell development.

Once Cabal is installed, you can use it to install packages by running commands like cabal install <package-name>. Cabal will handle the dependency resolution and installation process automatically, fetching packages from the Hackage repository, which is a central hub for Haskell packages.

Cabal also allows you to create and manage projects using the cabal init command, which generates the initial project structure and configuration files for you.

In summary, Cabal is an important component of the Haskell ecosystem, providing a way to manage dependencies, build, install, and manage Haskell packages and projects.