📜block

use { ... } to group statements.

JS ⟩ statement ⟩ other ⟩ block

(statement) use { ... } to group statements.

⭐️ 重點

not block：

• object literal / class / switch： no block scope❗

• function：its scope is different from a block scope❗

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

break / continue

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

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

if the code you need to wrap a scope around has return / this / break / continue in it：

• don't use function / IIFE (which has its own function boundary)❗

• use block instead.

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

A "variable" is just a property of the environment record (associated with the currently executing block /function /module /script).

🔴 主題

• block scope

👥 相關

• ℹ️braces {} punctuator is used in block.

📘 手冊

• Statements and declarations ⟩ Others ⟩ block