computed function

Use computed(<getter>,[depends],<options>) when creating the calculation attribute, whether it is synchronous calculation attribute or asynchronous computing attribute, you need to specify a Getter function, calculating logic for calculating attributes,The return value of this function is the value of the calculation attribute.

Synchronous calculation attributes and asynchronous calculations Getter the function signature is not the same, as follows:

Function signature

• The signature of the Getter function of the synchronous calculation attribute is as follows:

type ComputedGetter<Value = any, Scope = any> = (scope:Scope)=>Value

• The Getter function signature of the asynchronous calculation attribute is as follows:

type AsyncComputedGetter<Value,Scope=any,P extends Dict = Dict> = (
    scope:Scope,
    args:Required<AsyncComputedGetterArgs> & P) => Promise<Value>

Execute the calculation function

Automatic execution

When the dependence of the calculation attribute changes,AutoStore the calculation function will be automatically executed Getter.

Manually execute

Under normal circumstances, the computing function is not required, but in some special cases, the calculation function may be required manually. At this time, you can pass computedObjects.get('<id>').run() methods to manually execute the calculation function.

:: info More about computedObjects and manual execution, please refer to computed object chapter. :::