Course of Raku / Advanced / Subroutines / More on MAIN subroutines / Exercises

A command-line flag

Problem

A Bool named parameter of MAIN turns into an on/off flag: writing --flag sets it to True, and leaving it out keeps its default. Write a program whose MAIN takes Bool :$shout = False and prints HELLO when the flag is set, or hello otherwise.

Example

$ raku boolean-flag.raku
hello

$ raku boolean-flag.raku --shout
HELLO

Solution

✅ See the solution

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