Array/grep_vs_include?.rb
Blocks/implicit_block-vs-explicit_block.rb
Blocks/yield_if-vs-block_given_amp_amp.rb
Hash/has_key-vs-hash[key].rb
Integer/integer-vs-to_i.rb
Misc/gc-symbol_vs_string.rb
Misc/is_a?-vs-threequals.rb
Misc/lambdas_vs_class.rb
Misc/loop_vs_while.rb
String/downcase-eq-eq_vs_casecmp.rb
String/string_appender.rb
String/string_ranged_index.rb
String/to_s-vs-String_paren.rb