Mastering Modern Perl: Writing Efficient and Maintainable Code/

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Tailcall Optimization

Tailcall Optimization

Learn how to do tailcall optimization in Perl.

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Tailcalls

A tailcall occurs when the last expression within a function is a call to another function. The outer function’s return value becomes the inner function’s return value:

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sub log_and_greet_person {
    my $name = shift;
    # log the greeting into some log file...
    
    return greet_person( $name );
}
sub greet_person {
    my $name = shift;
    # ...
    say "Hi $name, and welcome!";
}
log_and_greet_person "Sam";

Tailcall optimization

Returning from greet_person() directly to the caller of log_and_greet_person() is more efficient than returning to ...