📜label

JS ⟩ statement ⟩ other ⟩ label

(statement)

prefixes a statement with an identifier which you can refer to.

<label> : <statement>        // syntax

⭐️ 重點

label is only used by break / continue.

( nested loop)

labeled statement is needed

• when you want to skip to the next iteration of an outer loop that is not the nearest enclosing loop.

• when you want to break out of a statement that is not the nearest enclosing loop / switch.

The namespace for labels is different than the namespace for variable(s) and function(s), the same identifier can be used as label / variable or function name.

"the statement that you identify with a label may be any statement."

📘 MDN

🔴 主題

• flow control

  • continue

  • break

📗 參考

• JavaScript: The Definitive Guide ⟩ 5.5.1 Labeled Statements

📘 手冊

• Statements and declarations ⟩ Others ⟩ label ⭐️

• Loops and iteration ⟩ label statement