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Re^5: Simplifying repeated parameter lists (lambdas, anonymous functions, closures, currying )

by Anonymous Monk
on Sep 19, 2012 at 20:44 UTC ( #994537=note: print w/ replies, xml ) Need Help??


in reply to Re^4: Simplifying repeated parameter lists
in thread Simplifying repeated parameter lists

That could have worked :)

lambdas , lambda
The first lambda language to go mainstream ?

a new keyword "lambda language"

https://en.wikipedia.org/wiki/Lambda_language
https://en.wikipedia.org/wiki/Lambda_language#Lambda_calculus_and_programming_languages
https://en.wikipedia.org/wiki/Lambda_language#Anonymous_functions
https://en.wikipedia.org/wiki/Anonymous_function
https://en.wikipedia.org/wiki/Anonymous_function#Closures
https://en.wikipedia.org/wiki/Anonymous_function#Currying
https://en.wikipedia.org/wiki/Anonymous_function#Perl
Perl 5 supports anonymous functions, as follows:
(sub { print "I got called\n" })->(); # 1. fully anonymous, ca +lled as created my $squarer = sub { my $x = shift; $x * $x }; # 2. assigned to a varia +ble sub curry { my ($sub, @args) = @_; return sub { $sub->(@args, @_) }; # 3. as a return value o +f another function } # example of currying in Perl sub sum { my $tot = 0; $tot += $_ for @_; $tot } # returns the sum of +its arguments my $curried = curry \&sum, 5, 7, 9; print $curried->(1,2,3), "\n"; # prints 27 ( = 5 + 7 + 9 + 1 + 2 + +3 )


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