Question 1

How do I exclude Prelude from a PureScript module?

Accepted Answer

You can exclude it by using the 'import' statement with the 'hiding' keyword or by explicitly importing only what you need, though it's auto-imported by default. Refer to PureScript's language guide for specific syntax.

Question 2

Is PureScript Prelude enough to build a full application?

Accepted Answer

No, Prelude provides only core types and classes. For most real-world apps, you'll need additional libraries for areas like HTTP, UI, or databases, as it's designed as a foundational layer.

Question 3

How to install PureScript Prelude with spago?

Accepted Answer

Run 'spago install prelude' in your project directory, as specified in the README. Spago handles dependencies, and this command adds Prelude to your spago.dhall file.

Question 4

What's the difference between PureScript Prelude and Haskell's Prelude?

Accepted Answer

PureScript Prelude is more minimal and tailored for JavaScript compilation, avoiding Haskell's historical quirks. It focuses on core functional types, making it cleaner but less feature-rich out of the box.

Question 5

Can I customize or extend Prelude with my own types?

Accepted Answer

Not directly, as it's a standard library. However, you can create separate modules for custom types and import them alongside Prelude to extend functionality without modifying the core.

Question 6

How to use Maybe and Either for error handling in PureScript?

Accepted Answer

Prelude includes Maybe for optional values and Either for errors. Use pattern matching and functions like 'map' or 'bind' from the Functor and Monad type classes to handle cases safely.

purescript-prelude

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