Style-ExplicitBlockArgument.md

Pattern: Missing use of explicit block argument

Issue: -

Description

This rule enforces the use of explicit block argument to avoid writing block literal that just passes its arguments to another block.

Examples

# bad
def with_tmp_dir
  Dir.mktmpdir do |tmp_dir|
    Dir.chdir(tmp_dir) { |dir| yield dir } # block just passes arguments
  end
end

# bad
def nine_times
  9.times { yield }
end

# good
def with_tmp_dir(&block)
  Dir.mktmpdir do |tmp_dir|
    Dir.chdir(tmp_dir, &block)
  end
end

with_tmp_dir do |dir|
  puts "dir is accessible as a parameter and pwd is set: #{dir}"
end

# good
def nine_times(&block)
  9.times(&block)
end

Further Reading

• RuboCop - Style/ExplicitBlockArgument
• The Ruby Style Guide