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[Ruby] ifとunlessの考え方の違い

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ifとunlessの違いがわかっていませんでしたので、自分なりに纏めてみました。

#if ~ end
if A == B 
 puts C
end
#unless ~ end
unless A == B
 puts C
end

どちらもtrueで処理が実行されていくのは一緒です。
ですが、trueになる条件が違います。

①ifの場合、真がtrueとなり、処理が実行される。

#if ~ end
if A == B 
 puts C
end

②unlessの場合、偽がtrueとなり、処理が実行される。

#unless ~ end
unless A == B
 puts C
end

勘違いしやすいですが、処理される条件を理解してメソッドを使用しましょう。

 

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