๐ง ๆฝๅทฅไธญ
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โฉ โฉ expression
evaluates to a value (may cause side effects).
GRAMMAR OF AN EXPRESSION
expression โ opt opt opt
expression-list โ | ,
,
an expression is a simple statement (hence, a statement).
four kinds of expressions: / prefix / infix / postfix.
closure expression
prefix expressions ๐ง
infix expressions ๐ง
postfix expressions ๐ง
what is a value? side effect?