Rubyでの演算処理は、以下の優先順位に従って実行される。
優先順位：高
::
[]
+(単項), !, ~
**
-(単項)
*, /, %
+, -
<<, >>
&
|, ^
\>, >=, <, <=
<=>, ==, ===, !=, =~, !~
&&
||
.., ...
?:(条件演算子)
= (+=, -=, ...等も含む)
not
and, or
優先順位：低
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