What are the differences between function expressions and arrow functions in JavaScript?

What are the differences between function expressions and arrow functions in JavaScript?

Function expressions are traditional functions defined with the 'function' keyword, while arrow functions use the '=>' syntax. Arrow functions also have a different behavior for the 'this' keyword.

Can you explain how 'this' works differently in arrow functions?

Sure! In arrow functions, 'this' is lexically bound, meaning it retains the value of 'this' from the enclosing context. In contrast, regular functions have their own 'this' context.

Are there any performance differences between the two?

Generally, there are no significant performance differences. However, arrow functions can be slightly faster in certain scenarios due to their concise syntax.

When should I use one over the other?

Use arrow functions when you need to preserve the context of 'this', especially in callbacks. Use function expressions when you need a traditional function with its own 'this' context.