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Get Started with F# in Visual Studio Code. 8 minutes to read. Contributors. In this article You can write F# in with the to get a great cross-platform, lightweight Integrated Development Environment (IDE) experience with IntelliSense and basic code refactorings. Visit to learn more about the plugin.
To begin, ensure that you have. Creating your first project with Ionide To create a new F# project, open Visual Studio Code in a new folder (you can name it whatever you like). Next, open the command palette ( View Command Palette) and type the following: F# new project This is powered by the project. Note If you don't see template options, try refreshing templates by running the following command in the Command Palette: F#: Refresh Project Templates. Select 'F#: New Project' by hitting Enter.
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This takes you to the next step, which is for selecting a project template. Pick the classlib template and hit Enter. Next, pick a directory to create the project in. If you leave it blank, it uses the current directory.
Finally, name your project in the final step. F# uses for project names. This article uses ClassLibraryDemo as the name. Once you've entered the name you want for your project, hit Enter. If you followed the previous step, you should get the Visual Studio Code Workspace on the left-hand side to appear with the following:. The F# project itself, underneath the ClassLibraryDemo folder.
The correct directory structure for adding packages via. A cross-platform build script with. The paket.exe executable that can fetch packages and resolve dependencies for you. A.gitignore file if you wish to add this project to Git-based source control.
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Writing some code Open the ClassLibraryDemo folder. You should see the following files:. ClassLibraryDemo.fs, an F# implementation file with a class defined. ClassLibraryDemo.fsproj, an F# project file used to build this project. Script.fsx, an F# script file that loads the source file. paket.references, a Paket file that specifies the project dependencies. Open Script.fsx, and add the following code at the end of it: let toPigLatin (word: string) = let isVowel (c: char) = match c with 'a' 'e' 'i' 'o' 'u' 'A' 'E' 'I' 'O' 'U' - true - false if isVowel word.0 then word + 'yay' else word.1.
+ string(word.0) + 'ay' This function converts a word to a form of. The next step is to evaluate it using F# Interactive (FSI). Highlight the entire function (it should be 11 lines long).
Once it is highlighted, hold the Alt key and hit Enter. You'll notice a window pop up below, and it should show something like this: This did three things:. It started the FSI process. It sent the code you highlighted over the FSI process.
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The FSI process evaluated the code you sent over. Because what you sent over was a, you can now call that function with FSI! In the interactive window, type the following: toPigLatin 'banana';; You should see the following result: val it: string = 'ananabay' Now, let's try with a vowel as the first letter.
Enter the following: toPigLatin 'apple';; You should see the following result: val it: string = 'appleyay' The function appears to be working as expected. Congratulations, you just wrote your first F# function in Visual Studio Code and evaluated it with FSI! Note As you may have noticed, the lines in FSI are terminated with;.
This is because FSI allows you to enter multiple lines. The;; at the end lets FSI know when the code is finished. Explaining the code If you're not sure about what the code is actually doing, here's a step-by-step.
As you can see, toPigLatin is a function that takes a word as its input and converts it to a Pig-Latin representation of that word. The rules for this are as follows: If the first character in a word starts with a vowel, add 'yay' to the end of the word. If it doesn't start with a vowel, move that first character to the end of the word and add 'ay' to it. You may have noticed the following in FSI: val toPigLatin: word:string - string This states that toPigLatin is a function that takes in a string as input (called word), and returns another string. This is known as the, a fundamental piece of F# that's key to understanding F# code. You'll also notice this if you hover over the function in Visual Studio Code.