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JS ⟩ statement ⟩ control flow ⟩ branch ⟩ switch
(statement)
switch (<expr>) { case <value1> : <statements> case <value2> : <statements> default : <statements> }
not block：
object literal / class / switch ( no block scope)
function's scope is different from a block scope
📗 You Don't Know JS Yet: Scopes & Closrues
labeled statement is needed when you want to break out of a statement that is not the nearest enclosing loop / switch.
the comparison between switch (expr) and a case clause is done by strict equality (===).
(expr)
switch statement uses punctuators (), {}, :.
()
{}
:
JavaScript: The Definitive Guide ⟩ 5.3.3 switch
Statements and declarations ⟩ control flow ⟩ switch ⭐️