Function Expressions
Function expressions are a way to define functions in programming languages, typically by assigning an anonymous or named function to a variable or property. They are a fundamental concept in languages like JavaScript, where functions are first-class objects, allowing them to be passed as arguments, returned from other functions, and stored in data structures. This contrasts with function declarations, which are hoisted and defined at parse time.
Developers should learn function expressions to write more flexible and modular code, especially in functional programming paradigms or when working with callbacks, event handlers, and higher-order functions. They are essential in JavaScript for creating closures, implementing IIFEs (Immediately Invoked Function Expressions), and managing scope, making them crucial for web development, asynchronous operations, and library/framework usage like React or Node.js.