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. Introduction to Javascript Anonymous Function. Name Anonymous indicates without a name or unknown name. So, an anonymous function defined as a function without a name. Whenever function wants to return other functions than simply used this anonymous function concept. used as data (since that's often how the lambda/anonymous function is used in an applied JavaScript context.) If I were describing a lambda to someone in a JS discussion that was new to the concept then I would describe it as, "an anonymous function, often used as data, and to return data, for an invoking function." In this example, we pass an anonymous function into the setTimeout() function. The setTimeout() function executes this anonymous function one second later. Note that functions are the first-class citizens in JavaScript, so you can pass a function to another as an argument. Immediately invoked function execution It is the difference between an anonymous function and a normal function. Finally, we have invoked the created function. So, in this way the basic implementation of an anonymous function is done. Use of Anonymous Functions in JavaScript. We can use the anonymous function in JavaScript for several purposes. Some of them are given below: The function above is actually an anonymous function (a function without a name). Functions stored in variables do not need function names. They are always invoked (called) using the variable name. The function above ends with a semicolon because it is a part of an executable statement. The two most common ways to create a function in javascript are by using the function declaration or function operator. Anonymous functions are created using the function operator. Anonymous functions are used heavily in JavaScript for many things, most notably the many callbacks used by the language's many frameworks. The former is a function declaration whereas the latter is a variable assignment to an anonymous function. Although they may appear to have the same effect, JavaScript does treat them slightly differently. To understand the difference, I recommend reading, “JavaScript function declaration ambiguity”. An anonymous function is not a function with the name "". It is simply a function without a name. Like any other value in JavaScript, a function does not need a name to be created. Though it is far more useful to actually bind it to a name just like any other value. But like any other value, you sometimes want to use it without binding it to a name. Defining an Anonymous Function. When a function is defined, you often give it a name and then invoke it using that name, like so: foo(); function foo(){ // } When you define a function this way, the Javascript runtime stores your function in memory and then creates a reference to that function, using the name you've assigned it.
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