【RuboCopエラー】Use the return of the conditional for variable assignment and comparison.

rubocopでUse the return of the conditional for variable assignment and comparison.のエラーが出た時の対処法。

1. 環境

• rubocop 1.30.0
• Ruby 3.1.0

2. エラー内容

Use the return of the conditional for variable assignment and comparison.

変数の代入と比較には、条件式の戻り値を使用してください。

3. エラー対処法

# bad
if foo
  bar = 1
else
  bar = 2
end

# good
bar = if foo
        1
      else
        2
      end

• RubyDoc.info: Class: RuboCop::Cop::Style::ConditionalAssignment – Documentation for rubocop (1.81.1) – RubyDoc.info
• rubocop/ruby-style-guide: A community-driven Ruby coding style guide
• Ruby: Use the return of the conditional for variable assignment and comparison - Stack Overflow
• 【Rubocop】Use the return of the conditional for variable assignment and comparison.エラーの対処法 - 紙一重の積み重ね