PureScript

“`purs
module Main where

main :: IO ()
main = putStrLn “Hello World!”
“`

Explanation:

• module Main where: This line declares a module named Main. In PureScript, your program must be within a module. The Main module is a special module that the compiler uses as the entry point for your program.
• main :: IO (): This declares the main function.
  • main is the entry point of your application. The compiler will execute this function when your program runs.
  • :: IO () specifies the type of the main function. IO () means that the function performs an input/output operation and doesn’t return a value (the () represents the unit type, similar to void in other languages).
• main = putStrLn "Hello World!": This is the body of the main function.
  • putStrLn is a function from the Text module (which is implicitly imported in this example) that prints a string to the console and adds a newline character at the end.
  • "Hello World!" is the string literal to be printed.

How to compile and run this code:

1. Save the code: Save the code in a file named Main.purs.
2. Compile: Use the PureScript compiler (psc) to compile the code:

   psc Main.purs
   

   This will generate an executable file named Main.

3. Run: Execute the compiled program:

   ./Main
   

   The output will be:

   Hello World!
   

Dependencies:

The putStrLn function comes from the Text module. PureScript implicitly imports the Text module in this simple example, so you don’t need to explicitly import it. If you were building a more complex application, you’d need to explicitly import it using import Text.

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