Vue Js Computed Property
Vue Js Computed Property:Computed properties in Vue.js are functions that compute and return a value based on other properties of the Vue instance. Vue Js computed properties are cached and re-evaluated only when their dependent properties change, which improves the performance of the application.
To create a computed property, you can define a function on the computed object of a Vue instance or a component. Within this function, you can access the properties of the instance or component that this computed property depends on using the 'this' keyword. Whenever any of the dependent properties change, the computed property is automatically re-evaluated and the new value is cached. Computed properties are a powerful feature of Vue.js that simplify the process of calculating and updating data in response to changes.
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What is a Vue Js computed property and how is it different from a method or a data property?
In Vue js Computed property is a type of property that is used to define a value that is derived based on the current state of other properties in the Vue instance. Vue Js Computed properties are defined using the computed
option when creating a Vue instance.
In the code, the square
computed property is defined as a function that returns the square of the numberInput
property. Whenever numberInput
is updated, the computed property square
will automatically re-compute its value.
The key difference between a Vue Js computed property and a method is that computed properties are cached based on their dependencies, while methods are not. This means that if a computed property's dependencies have not changed, accessing the computed property will return the cached value instead of recomputing it. On the other hand, a method will always be re-executed when it is called.
A data property, on the other hand, is used to define reactive data that is used within the Vue instance. Data properties can be directly accessed and modified, whereas computed properties are read-only and cannot be directly modified.
In summary, Vue Js computed properties provide a way to define derived values that automatically update based on changes to their dependencies, and they are cached for better performance