What are function expressions in JavaScript?

What are function expressions in JavaScript?

Function expressions are a way to define functions in JavaScript. Unlike function declarations, they 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 a function expression different from a function declaration?

A function declaration starts with the function keyword and has a name, while a function expression can be anonymous and is often assigned to a variable. For example:

Function Declaration:

function multiply(a, b) {
    return a * b;
}

Function Expression:

const multiply = function(a, b) {
    return a * b;
};