PureScript Language Reference

As an introductory example, here is the usual "Hello World" written in PureScript:

purescript

module Main where

import Effect.Console

main = log "Hello, World!"

Another Example

The following code defines a Person data type and a function to generate a string representation for a Person:

purescript

data Person = Person { name :: String, age :: Int }

showPerson :: Person -> String
showPerson (Person o) = o.name <> ", aged " <> show o.age

examplePerson :: Person
examplePerson = Person { name: "Bonnie", age: 26 }

Line by line, this reads as follows:

Person is a data type with one constructor, also called Person
The Person constructor takes an object with two properties, name which is a String, and age which is an Int
The showPerson function takes a Person and returns a String
showPerson works by case analysis on its argument, first matching the constructor Person and then using string concatenation and object accessors to return its result.
examplePerson is a Person object, made with the Person constructor and given the String "Bonnie" for the name value and the Int 26 for the age value.

The full language reference continues below: