What is a function expression in JavaScript?

What is a function expression in JavaScript?

A function expression is a way to define a function in JavaScript. Unlike function declarations, function expressions can be anonymous and are often used as arguments to other functions.

Can you give me an example of a function expression?

Sure! Here's a simple example:

const add = function(a, b) {
    return a + b;
};

In this case, add is a function expression that takes two parameters and returns their sum.

How is it different from a function declaration?

The main difference is that function declarations are hoisted, meaning they can be called before they are defined, while function expressions are not hoisted.

When should I use function expressions?

You should use function expressions when you need a function that is only used in a specific context, like a callback function, or when you want to create closures.