Singleton

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Singleton

Purpose
Sometimes, when we are creating libraries for other users, we might want to group similar functions together to improve user experience.
Example
Suppose we are creating a library that allow the user to access the file system. And we wish that our code looks like this:
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=fs.open("Hello world.txt")
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First, we need to create a tagged union with only a single tag:
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FileSystem = choice.new
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Then, create a constant alias:
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fs = FileSystem.new
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After that, we can proceed to define the functions we intend to expose:
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(this FileSystem).open(filename String) = undefined
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(this FileSystem).rename(oldname String) as(newname String) = undefined
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(this FileSystem).delete(filename String) = undefined
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And the client can use them as follows:
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=fs.open("Hello world.txt")
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=fs.rename("Jojo.md") as("Koko.md")
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=fs.delete("/")
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Purpose

Example