And this is something called an anonymous function, because it doesn't have a name. And this is something that's used throughout JavaScript. Again, it seems very strange to a Java programmer, but in JavaScript this is really core functionality where we just create a function on the fly and pass it into another function. Inside the () is an anonymous function. Its anonymous because there is no name assigned to it. The function can have parameters passed in, as we will see in a moment, just like any other function. Inside the function is the actual code you want to execute. After the function definition is another set of parenthesis. Beware Anonymous Functions. Anonymous functions bound everywhere are a pain. They're difficult to debug, maintain, test, or reuse. Instead, use an object literal to organize and name your handlers and callbacks. 1. Summary: in this tutorial, you will learn about JavaScript anonymous functions. Introduction to JavaScript anonymous functions. An anonymous function is a function without a name. An anonymous function is often not accessible after its initial creation. The following shows an anonymous function that displays a message: The inner function is where you put all your own code. jQuery's ready() function expects a function parameter and executes it when the DOM is ready. Note that it doesn't have to be an anonymous function. [code]$(document).ready(function() { /... After the first 2 variable values are displayed, eat method checks if the 3rd parameter is actually present and is a function – if so, it’ll call the function. So, the callback method is called after its preceding arguments are processed. Anatomy and Working of Callback methods / anonymous functions Doing it this way creates an anonymous function that is then executed immediately with the jQuery object being passed as the function argument, effectively ensuring that $ is the jQuery object. Is this the only point - to guarantee that jQuery is bound to '$' or are there other reasons to do this? You define an anonymous function that takes one argument: a variable named $, which you use in the statement $ ("a"). Then you call your anonymous function and pass it the jQuery object, so inside the function, $ === jQuery. Example 2: I tried the same function without the (jQuery) at the end. Now it is not working. When a function is defined without a name, it's known as an anonymous function. The function is stored in memory, but the runtime doesn't automatically create a reference to it for you. At first glance, it may appear as if such a thing would have no use, but there are several scenarios where anonymous functions are very convenient. Search Results for: anonymous function. Effects > Custom.animate() Perform a custom animation of a set of CSS properties. Types. This page documents data types appearing in jQuery function signatures, whether defined by JavaScript itself or further restricted by jQuery. Unless explicitly stated otherwise, jQuery functions require primitive
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