🔀switch

JS ⟩ statement ⟩ control flow ⟩ branch ⟩ switch

(statement)

switch (<expr>) {
    case <value1> : <statements>
    case <value2> : <statements>
    default       : <statements>
}

⭐️ 重點

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 (===).

👥 相關

• switch statement uses punctuators (), {}, :.

📗 參考

• JavaScript: The Definitive Guide ⟩ 5.3.3 switch

📘 手冊

• Statements and declarations ⟩ control flow ⟩ switch ⭐️