# Anonymous Functions in JavaScript

[Anonymous functions in JavaScript](https://www.almabetter.com/bytes/tutorials/javascript/anonymous-functions-in-javascript) are functions that are defined without a name. They are commonly used as arguments to other functions or as immediately invoked function expressions (IIFE).

Here's an example of an anonymous function:

```javascript
javascriptCopy code// Anonymous function as a callback
setTimeout(function() {
  console.log('This is an anonymous function.');
}, 1000);
```

In this example, `setTimeout` is a function that takes another function (the callback) as its first argument. The function passed as an argument is an anonymous function because it doesn't have a name.

Anonymous functions can also be used as IIFE, which are functions that are executed immediately after they are defined. Here's an example:

```javascript
javascriptCopy code// Immediately Invoked Function Expression (IIFE)
(function() {
  console.log('This is an IIFE.');
})();
```

In this example, the anonymous function is enclosed within parentheses and followed by `()` to immediately invoke it.

Anonymous functions are often used in situations where a function is needed temporarily or where a function doesn't need to be referenced by name. They are commonly used in event handling, asynchronous callbacks, and for scoping purposes. Check out the free [online JS tutorial](https://www.almabetter.com/bytes/tutorials/javascript) for more info like this!