*Type of Functions *
Here the main types of functions in JavaScript:
1. Named Function
A function that has its own name when declared. It’s easy to reuse and debug because the name shows up in error messages or stack traces.
function greet() {
return "Hello!";
}
console.log(greet());
2. Anonymous Function
A function that does not have a name. It is usually assigned to a variable or used as a callback. Since it has no name, it cannot be called directly.
const greet = function() {
return "Hi there!";
};
console.log(greet());
3. Function Expression
When you assign a function (can be named or anonymous) to a variable. The function can then be used by calling that variable.
const add = function(a, b) {
return a + b;
};
console.log(add(2, 3));
4. Arrow Function (ES6)
A new way to write functions using the => syntax. They are shorter and do not have their own this binding, which makes them useful in some cases.
const square = n => n * n;
console.log(square(4));
5. Immediately Invoked Function Expression (IIFE)
IIFE functions are executed immediately after their definition. They are often used to create isolated scopes.
(function () {
console.log("This runs immediately!");
})();
6. Async Function
Functions that handle asynchronous tasks. Declared with async, they return a Promise, and you can use await inside them to pause until another Promise resolves.
async function fetchData() {
return "Data fetched!";
}
fetchData().then(console.log);
7.Pure Functions
Pure functions return the same output for the same inputs and do not produce side effects. They do not modify state outside their scope, such as modifying global variables, changing the state of objects passed as arguments, or performing I/O operations.
function pureAdd(a, b) {
return a + b;
}
console.log(pureAdd(2, 3));
Callback Functions
Constructor Function
Generator Function
Recursive Function
Higher-Order Function
Nested Functions
Rest Parameter Function
[TBH]
Reference
https://www.geeksforgeeks.org/javascript/functions-in-javascript/
Top comments (1)
greetin your anonymous function example is NOT anonymous - see here