Something to allow you to change $_ to a real variable in blocks

[schwern]

Like in Ruby.

@foo = map { |$var| $var++ } @bar;

to be equivalent to

@foo = map { $_++ } @bar;

Perhaps using Data::Bind?

[schwern]

Integrating this with autoboxing and subroutine signatures, it would be...

my $foo = @bar->map(sub ($var) { $var++ });

[exodist]

Using Devel::Declare I can make
nmap my $var { "xxx" . $var } @list
and
ngrep my $var { $var eq .... } @list

But I cannot override actual grep and map.

the following all would work:

{
    my $var;
    nmap $var { ... }
}
nmap my $var { ... } @list
nmap local $var { ... } @list
nmap our $var { ... } @list

Would this be sufficient? or should we wait to override the actual map and grep builtins?

[exodist]

Scratch the local, but otherwise this is done:

http://github.com/exodist/Block-NamedVar - also uploaded to cpan, but may take a while to propogate

I will try to put this into my branch of perl5i tonight

[exodist]

nmap and ngrep are added in http://github.com/exodist/perl5i - master

[schwern]

Good work, but I have to rain on it.

Currently, perl5i cannot depend on Devel::Declare because it breaks one liners. That is open for debate as it blocks a lot of useful features. One possibility is for the perl5i binary to intercept -e and turn it into a real program.

[exodist]

"One possibility is for the perl5i binary to intercept -e and turn it into a real program."

Whats preventing us from doing this? is it a decision that has been made? If I were to do this would it be accepted (depending on implementation and quality of course)

[exodist]

My master has -e capturing added, DD works with my cli tests.

[schwern]

Its in 2.3.0_01. I suspect this feature will go away in v3 and be replaced with something using subroutine signatures. Example:

@new_array = @array->map( func($item) { ... } );

Especially if we can get rid of parens around methods.

@new = @array->map def($item) { ... };