Apr 16, 2025 · Anonymous functions are a powerful feature in JavaScript that help keep code clean and concise. They are great for one-time tasks like callbacks or event handlers. With the introduction of arrow functions in ES6, writing anonymous functions has …

Introduction to JavaScript anonymous functions. An anonymous function is a function without a name. The following shows how to define an anonymous function: (function { //...}); Code language: JavaScript (javascript) Note that if you don’t place the anonymous function inside the parentheses (), you’ll get a syntax error

Mar 9, 2012 · You can use Immediately Invoked Function Expression: var fn_str = "function(){ alert('called'); }"; eval('(' + fn_str +')();'); Immediately Invoked Function Expression. Another way is to use to a Function object (If you have the function body string): var func = new Function("alert('called')"); func.apply(this);

Jun 16, 2020 · An anonymous function can be defined as an immediately invoked function expression, assigned to a variable, or as an argument that is passed to another function. An anonymous function can be used if it is an immediately executing function or a call back function.

Aug 13, 2009 · A simple example of defining a function as a string, eval()ing it, and passing in a parameter while immediately invoking the function (and then dumping the result to the console): console.log('eval: %s', eval("(function(foo) { return foo.bar; })")({"bar": "12345"}));

Feb 25, 2025 · Learn anonymous functions in JavaScript with example, syntax for anonymous function with function constructor, use of anonymous functions

However, there are many ways to use functions in JavaScript and some of them works great with a so-called anonymous function. The most common use case is probably when you need to pass in the function as a parameter to another function, often referred to as a callback function.

In this blog, we’ll explore practical examples of anonymous functions and demonstrate how they can improve your JavaScript code. 1. Introduction to Anonymous Functions. 2. Basic Syntax of Anonymous Functions. 3. Using Anonymous Functions as Event Handlers. 4. Self-Invoking Anonymous Functions (Immediately Invoked Function Expressions) 4.1.

In JavaScript, you can call an anonymous function from a string using the eval() function. However, it's important to note that using eval() can be potentially dangerous if you're evaluating arbitrary user input, as it can execute arbitrary code and pose security risks.

At the end of this Tutorial, you will be able to: Create a function expression whose value is stored in a variable. Create an anonymous function based on a function expression. Recognise that, unlike function declarations, function expressions are not hoisted. Use arguments and parameters to pass values to an anonymous function.