🔰expression
🚧 施工中
evaluates to a value (may cause side effects).
GRAMMAR OF AN EXPRESSION
expression → try-operator opt await-operator opt prefix-expression infix-expressions opt
expression-list → expression | expression
,expression-list
an expression is a simple statement (hence, a statement).
four kinds of expressions: primary / prefix / infix / postfix.
prefix expressions 🚧
infix expressions 🚧
postfix expressions 🚧
what is a value? side effect?
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