⤴️break

JS ⟩ statement ⟩ control flow ⟩ break

(statement) exit immediately

• the current (innermost eclosing) loop/ switch

• or labeled statement.

break;              // break current loop/switch
break <label>;      // break labeled statement

🧨 雷區

break statement (with or without a label) can not transfer control across function boundaries. cannot label a function definition statement, for example, and then use that label inside the function.

break / continue won't operate across an IIFE function boundary to control an outer loop/block.

📗 You Don't Know JS Yet: Scopes & Closrues

⭐️ 重點

label is only used by break / continue.

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

if the code you need to wrap a scope around has return, this, break, or continue in it, don't use a function/IIFE(which has its own function boundary), use a block instead❗️

📗 You Don't Know JS Yet: Scopes & Closrues

👥 相關

• label is only used by break / continue.

🔴 主題

• continue vs. break

📘 手冊

• Statements and declarations ⟩ control flow ⟩ break ⭐️

• Loops and iteration ⟩ break statement