What are computed properties in Vue.js?

What are computed properties in Vue.js?

Computed properties are a powerful feature in Vue.js that allow you to define properties that depend on other data properties. They are reactive and will automatically update when their dependencies change.

Can you give me an example of how to use computed properties?

Sure! For instance, if you have a data property called firstName and another called lastName, you can create a computed property called fullName that concatenates them: fullName() { return this.firstName + ' ' + this.lastName; }.

How do computed properties differ from methods?

Computed properties are cached based on their dependencies, meaning they only re-evaluate when their dependencies change. Methods, on the other hand, are executed every time they are called.

When should I use computed properties instead of data?

Use computed properties when you need to derive a value based on other data properties. If you just need to store static data, use data properties instead.