Programming-Idioms

Edit summary for version 13 by andrezgz:
[Perl] Adding demo

↷

2019-09-27, 23:27:30

2019-09-27, 23:29:08

Idiom #189 Filter and transform list

Produce a new list y containing the result of function T applied to all elements e of list x that match the predicate P.

Produce a new list y containing the result of function T applied to all elements e of list x that match the predicate P.

map apply

map apply

my @y = map { T($_) } grep { P($_) } @x;

my @y = map { T($_) } grep { P($_) } @x;

$_ inside grep block represents each element e of array x

$_ inside grep block represents each element e of array x

http://codepad.org/BbpkDumF

Next change ↷