ハッシュからエントリを削除する
h = { 'Apple' => 'red', 'Banana' => 'yellow', 'Lemon' => 'yellow', 'Carrot' => 'orange' } p h.delete('Banana') #=>"yellow" p h #=> {"Lemon"=>"yellow", "Carrot"=>"orange", "Grape"=>"purple", "Apple"=>"red"}
h = { 'Apple' => 'red', 'Banana' => 'yellow', 'Lemon' => 'yellow', 'Carrot' => 'orange' } p h.delete('Banana') #=>"yellow" p h #=> {"Lemon"=>"yellow", "Carrot"=>"orange", "Grape"=>"purple", "Apple"=>"red"}