Course of Raku / Advanced / Modules / Modules basics / Exercises

Load at run time

Problem

You are given a module Greeting.rakumod that exports a subroutine hello:

unit module Greeting;

sub hello($name) is export {
    "Hello, $name!"
}

Load this module with require instead of use, so it is brought in at run time. Because require does not import names automatically, list the symbol you want with require Greeting <&hello>;. Then call hello('Sam') and print the result.

To show off what run-time loading buys you, put the require inside a sub MAIN with a --quiet flag, so that the module is loaded only when a greeting is actually wanted. With --quiet, the program prints Silence. and never touches the module at all.

Example

Run with the module on the search path, the program prints:

$ raku -I. require-import.raku
Hello, Sam!

$ raku -I. require-import.raku --quiet
Silence.

Solution

✅ See the solution

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