But a real routine invoking the new routine could achieve the same result.

Of course. Currying is just a shortcut.

On the other hand, putting my in the main script will not have any effect in the package, will it?

I think that's the point :-)

In Damian's example the List::Part::part() function is non-upwardly compatable with earlier versions because of the addition of the parameter.

The problem is - how do we make legacy code that calls the old-style part() use the new-style part()?

One option would be to go through them by hand and alter the calls to part() appropriately.

Instead, we can add a single line that creates a lexically scoped subroutine that curries in the old default label arguments - so the calls to the old-style part() will continue to work.

Make sense?

In reply to Re: Perl 6 Exegesis 6 pg 7 by adrianh
in thread Perl 6 Exegesis 6 pg 7 by TomDLux

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