🔰IIFE

Immediately-Invoked Function Expression

JS ⟩ concepts ⟩ expression ⟩ function expression ⟩ IIFE

immediately-invoked function expression

⭐️ 重點

a closure (or IIFE) can be used to create a scope to hide variables/functions.

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, 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

🔴 主題

• async IIFE

✨ 範例

• memoize by closure

💈範例

// ⭐️ IIFE
(function(){
    // ...
})();

// ⭐️ more compact form
!function(){
    // ...
}();

// ⭐️ arrow function as IIFE
(() => {
    // ...
})();

📗 參考

• JavaScriptTricks ⟩ Problem Solved By IIFE: Don't expose your variables globally

👥 相關

• arrow function can be used as IIFE.

• IIFE is a function expression.

• async IIFE

• Node.js automatically wraps the code of a JS file in a self IIFE.

• module pattern was implemented using IIFE.