Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap(3pm)

Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap3pm

Write "map { /$pattern/ } @list" instead of "map /$pattern/, @list".

Affiliation

This Policy is part of the core Perl::Critic distribution.

Overview

The expression forms of "grep" and "map" are awkward and hard to read. Use the block forms instead.

    @matches = grep   /pattern/,   @list;        #not ok
    @matches = grep { /pattern/ }  @list;        #ok
    @mapped = map   transform($_),   @list;      #not ok
    @mapped = map { transform($_) }  @list;      #ok

Configuration

This Policy is not configurable except for the standard options.

Releases

10 releases since Debian 5.0 (Lenny); the text changed 9 times.

  1. 5.0
  2. 6.0
  3. 7
  4. 8
  5. 9
  6. 10
  7. 11
  8. 12
  9. 13
  10. Arch

Author

Jeffrey Ryan Thalhammer <[email protected]>

From perl-perl-critic 1.156-3 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.