What are the differences between regular functions and arrow functions in JavaScript?

What are the differences between regular functions and arrow functions in JavaScript?

Regular functions and arrow functions differ in syntax, behavior of 'this', and how they handle arguments. Regular functions can be invoked with their own 'this' context, while arrow functions inherit 'this' from the surrounding lexical context.

Can you give me an example of both?

Sure! Here's a regular function:

function regularFunction() {
    console.log(this);
}

And an arrow function:

const arrowFunction = () => {
    console.log(this);
};

When should I use one over the other?

Use regular functions when you need a dynamic 'this' context, like in methods of objects. Use arrow functions for callbacks or when you want to maintain the 'this' context from the surrounding scope.

Are there any performance differences?

In general, the performance difference is negligible. However, arrow functions can be slightly faster in certain scenarios due to their simpler syntax and context handling.