Immediately-Invoked Function Expression (2010)
10 months ago
- #JavaScript
- #Closures
- #IIFE
- IIFE (Immediately-Invoked Function Expression) is a JavaScript pattern where a function expression is invoked immediately after its definition.
- The article clarifies misconceptions about terms like 'self-executing anonymous function' and advocates for the use of 'IIFE' for clarity and accuracy.
- IIFEs are useful for creating private scopes, avoiding global namespace pollution, and locking in variable states using closures.
- The article explains the syntax variations of IIFEs, including wrapping the function in parentheses and using unary operators to invoke the function immediately.
- Examples demonstrate how IIFEs can be used to handle event listeners in loops correctly by preserving the loop index via closures.
- The Module Pattern is introduced as a related concept, where an IIFE returns an object to encapsulate functionality and state.
- The article concludes with recommendations for further reading on functions, closures, and the Module Pattern.