Can I use arrow functions in class methods?

Can I use arrow functions in class methods?

Yes, you can use arrow functions in class methods. They maintain the context of 'this' from the surrounding scope.

What happens to 'this' when I use a regular function instead?

In regular functions, 'this' refers to the object that calls the method, which can lead to unexpected results.

Can you give me an example of both?

Sure! Here's an example:

class MyClass {
  constructor() {
    this.value = 42;
  }

  arrowMethod = () => {
    console.log(this.value);
  }

  regularMethod() {
    console.log(this.value);
  }
}

In this case, arrowMethod will always log 42, while regularMethod may not if called in a different context.

Are there any performance differences between the two?

Generally, the performance difference is negligible. However, arrow functions can lead to more concise code and avoid binding issues.