#VUE COMPUTED CODE#
The usual unit of code organization is a JavaScript object whose keys represent various possible types of a piece of a component. In case you are not already familiar with the new API, we will first describe the motivation behind it. Its introduction sparked much controversy when it was first discussed publicly. One of the most significant new features in Vue 3 is the Composition API. Vue 3 is a major rewrite of Vue 2, introducing a plethora of improvements while retaining backward compatibility with the old API almost in its entirety. At the very end, we will discuss what real-world use this improvement on-demand reactivity might have. After introducing the relevant new features, we will build a simple spreadsheet application to demonstrate the new expressiveness of Vue’s reactivity system. We will refer to this as on-demand reactivity. In the second part, we will focus on less-discussed aspects of using the new API, such as implementing reactivity-based features that were inexpressible in Vue 2’s reactivity system. In the first part of this article, we recap the standard motivation for a new API: better code organization and reuse. Arguably the most important introduction is the Composition API.
#VUE COMPUTED FULL#
When we run the example in the browser, the full name shows as expected. Return this.firstName + ' ' + this.lastName
#VUE COMPUTED HOW TO#
How to define a Computed PropertyĪ computed property is defined as a function in the This may sound a bit complicated at first, but computed properties are very easy to use.
Vue will only go through the re-render process if a computed property’s dependency changes.
We use them to compose data from existing sources.Ī major benefit of computed properties is that they are highly performant because they are cached. What is a Computed PropertyĬomputed properties are properties that can be bound to the template like data properties, but have logic like methods. If you already have one from the previous lesson, you can use it instead. If you want to follow along with the examples in this lesson, you will need an app generated by the Vue CLI We cover how their caching works and the benefits it provides our application, as well as how to easily read from and write to them with getters and setters. In this Vue tutorial we learn about computed properties with logic like methods.