Declaration and Structure

JavaScript functions are declared with the 'function' keyword, followed by an identifier, parentheses, and a block of code

First-Class Citizens

Functions in JavaScript can be stored in variables, passed as arguments, and returned from other functions

Hoisting and Closures

JavaScript functions exhibit hoisting and create closures, allowing them to be referenced before declaration and retain access to their enclosing scope

Named Functions

Named functions are declared with an identifier and are useful for identification and debugging

Anonymous Functions

Anonymous functions, without a name, are commonly used in expressions or as callbacks

Arrow Functions

Arrow functions, introduced in ES6, are concise and do not have their own bindings for 'this', 'arguments', 'super', or 'new.target'

Manipulating Data Structures

Functions are used to traverse and manipulate array elements, performing actions such as aggregation

Managing User Events

Functions are pivotal in managing user events, like clicks, to improve the interactive experience in web development

Server-Side Operations

Functions are integral for processing HTTP requests and interfacing with databases in server-side environments like Node.js

Callback Functions

Callback functions are used for asynchronous programming, delaying the execution of code until a specific event occurs

Closures

Closures enable functions to access and manipulate variables from an enclosing scope, even after the parent function has terminated

Higher-Order Functions

Higher-order functions, which can accept or return other functions, promote a more expressive and succinct coding style, particularly in array transformations and iterative operations