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【Ruby】大文字→小文字変換(アッパーケース→キャメルケース)

用意されているメソッド

大文字・小文字変換に使えるもの

upcase

全部大文字に変換

'abc'.upcase # => ABC

downcase

全部小文字に変換

'ABC'.downcase # => abc

capitalize

最初の文字を大文字に、他を小文字にする

'abc'.capitalize # => Abc

swapcase

小文字と大文字の入れ替え

'AbCd'.swapcase # => aBcD

camelize

キャメルケースに変換する。通常はアッパーキャメルケース。

'john_do'.camelize # => JohnDo

引数に:lowerを指定するとローワーキャメルケースになる

'john_do'.camelize(:lower) # => johnDo

underscore

スネークケースにする

'JohnDo'.underscore # => john_do

アッパーケース → ローワーキャメルケースへの変換

メソッドを組み合わせれば可能

"UPPER_CASE".downcase.camelize(:lower)
# -> upperCase

参考

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