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| # Moduleを使う DeepFreeze(自作) | |
| module Freeze | |
| def deep_freeze(object) | |
| object.freeze | |
| object.each do |element, value| | |
| element.freeze | |
| value&.freeze | |
| end | |
| end | |
| end | |
| class Team | |
| # クラス構文の直下ではクラスメソッドしか呼び出せない | |
| extend Freeze | |
| COUNTRIES = deep_freeze(['Japan', 'US', 'India']) | |
| end | |
| # 配列自身と配列の要素全部がfreezeされている | |
| puts Team::COUNTRIES.frozen? # => true | |
| puts Team::COUNTRIES.all? { |country| country.frozen? } # => true | |
| class Bank | |
| # クラス構文の直下ではクラスメソッドしか呼び出せない | |
| extend Freeze | |
| CURRENCIES = deep_freeze({ 'Japan' => 'yen', 'US' => 'dollar', 'India' => 'rupee' }) | |
| end | |
| # ハッシュ自身とハッシュの全要素（キーと値）がfreezeされている | |
| puts Bank::CURRENCIES.frozen? # => true | |
| puts Bank::CURRENCIES.all?{ |key, value| key.frozen? && value.frozen? } # => true |
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