Jeremy Howard wrote: > Anyhoo, there's no reason why you can't have ^1, ^2, and so forth, _and_ > allow named placeholders too. Although I don't see what this buys you. Argument ordering. We might be constrained by the caller as to what order the placeholders are passed in. Also, we want to make partial application, i.e. recurrying, as useful/simple as possible. So it's important to have the argument order independent of where the placeholders appear in the expression. my $f = (^x < ^max) ? ^x * ^scale : ^y * ^scale; has to be called &$f($x, $max, $scale, $y) First off this might not be the order the caller expects them in and we're sunk. Also, that's a pain to re-curry if we know $max and $scale but want $x and $y free: my $g = &$f(^_, 10, 2, ^_); Seems better to just write $f as: my $f = (^2 < ^1) ? ^2 * ^0 : ^3 * ^0; Alright, yeah, maybe not. That's total gibberish isn't it. ;) So how about taking the *original* $f and rebinding the order of all the arguments: my $f = &$f(^2, ^0, ^1, ^3); And the $g becomes: my $g = &$f(10, 2); Anyways, ^_ has my vote. (Although I really have a soft spot for that Oracle SQL*Plus variable syntax... ;) - Ken
- Re: Different higher-order func notation? (was Re: RF... Jeremy Howard
- Re: Different higher-order func notation? (was Re: RF... Damian Conway
- Re: Different higher-order func notation? (was Re: RF... Mike Pastore
- Re: Different higher-order func notation? (was Re: RF... John Porter
- Re: Different higher-order func notation? (was Re: RFC 23 ... Ken Fox
- Re: Different higher-order func notation? (was Re: RF... Mike Pastore
- Re: Different higher-order func notation? (was Re... Nathan Wiger
- Re: Different higher-order func notation? (was Re... Ken Fox
- Re: Different higher-order func notation? (was Re... Jeremy Howard
- Re: Different higher-order func notation? (was Re... Ken Fox
- Re: Different higher-order func notation? (was Re... Mike Pastore
- Re: Different higher-order func notation? (was Re... Jeremy Howard
- Re: Different higher-order func notation? (was Re... Nathan Wiger
- Re: Different higher-order func notation? (was Re... Damian Conway
- Re: Different higher-order func notation? (was Re... Jeremy Howard
- Re: Different higher-order func notation? (was Re... Damian Conway
- Re: Different higher-order func notation? (was Re... Jeremy Howard
- Re: Different higher-order func notation? (was Re... Glenn Linderman
- Re: Different higher-order func notation? (was Re... Nathan Wiger
- Re: Different higher-order func notation? (was Re... Bart Lateur