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RuboCop | Style/SpaceBeforeBlockBraces

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RuboCop | Style/SpaceBeforeBlockBraces

概要

RuboCopの「Style/SpaceBeforeBlockBraces」警告について。

ブロック呼び出しに利用するメソッド名とブレースの間に半角スペースを必要とするかどうかをチェックする。
デフォルトでは半角スペースが必要。

SpaceBeforeBlockBraces

設定値一覧

設定対象 対象 内容 デフォルト
EnforcedStyle space 半角スペースが必要
EnforcedStyle no_space 半角スペースが不要 --

検証プログラム

space_before_block_braces.rb
print [*1..5].each { |e|puts e }
print [*1..5].each{ |e|puts e }

実行結果 デフォルト の場合

.rubocop.yml
SpaceBeforeBlockBraces:
  EnforcedStyle: space
$ rubocop space_before_block_braces.rb
Inspecting 1 file
C

Offenses:

space_before_block_braces.rb:2:19: C: Space missing to the left of {.
print [*1..5].each{ |e|puts e }
                  ^

1 file inspected, 1 offense detected

実行結果 no_space に設定した場合

.rubocop.yml
SpaceBeforeBlockBraces:
  EnforcedStyle: no_space
  SupportedStyles:
$ rubocop space_before_block_braces.rb
Inspecting 1 file
C

Offenses:

space_before_block_braces.rb:1:19: C: Space detected to the left of {.
print [*1..5].each { |e|puts e }
                  ^

1 file inspected, 1 offense detected

対象コード

https://github.com/bbatsov/rubocop/blob/master/lib/rubocop/cop/style/space_before_block_braces.rb
https://github.com/bbatsov/rubocop/blob/master/spec/rubocop/cop/style/space_before_block_braces_spec.rb

補足

この警告は rubocop -a で修正可能です。

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