There are several types of functions in JavaScript

There are several types of functions in JavaScript
  • Function Declaration

  • Function Expression

  • Arrow Function:

  • Anonymous Function

  • Constructor Function

  • IIFE (Immediately Invoked Function Expression)

  • Generator Function

  • Async Function

Function Declaration

A function is declared using the "function" keyword. It can be called before or after it is defined in the code.

Function Expression

A function that is assigned to a variable. It can only be called after it has been defined.

Arrow Function

An Arrow Function (also known as a "fat arrow function") is a shorthand way of writing a function expression in JavaScript. It uses the "=>" operator to define the function. Here is an example of an arrow function.

If the function body contains only one expression, you can also use the shorthand version, omitting the curly braces and the "return" keyword:

Anonymous Function

An anonymous function is a function without a name. It is often used as a callback function, or passed as an argument to another function. Here is an example of an anonymous function.

Constructor Function

A constructor function is a special type of function in JavaScript that is used to create an object. It is called the "new" keyword and is used to set the initial properties and methods of the object.

IIFE (Immediately Invoked Function Expression)

A function that is immediately invoked after it is defined. It is often used to create a scope and protect variables from the global scope.

Generator Function

A function that can be paused and resumed multiple times. It is defined with the "function*" keyword and uses the "yield" keyword.

Async Function

An async function is a special type of function in JavaScript that can perform asynchronous tasks, such as making network requests or reading from a file. It is defined with the "async" keyword and uses the "await" keyword to wait for the completion of asynchronous operations.

Take note that these are the most typical JavaScript function types. Other function types might exist that are unique to particular libraries or frameworks.