# Computed Properties ( Proxied )

{% hint style="warning" %}
You must be on CBWIRE version 2.3.5 or later and enable the [Configuration](/v2-1/essentials/configuration.md) setting **useComputedPropertiesProxy** to follow this guide.

Otherwise, please follow [this guide](/v2-1/essentials/computed-properties.md) instead.
{% endhint %}

{% hint style="success" %}
In CBWIRE 2.3.5, we introduced the ability to proxy Computed Properties, which offers several advantages, including:

* Computed Properties are passed around as closures and are only rendered when called.
* The ability to invoke Computed Properties anywhere they are needed (both Actions and Templates).
* The ability to cache Computed Property results to enhance performance.
  {% endhint %}

Computed Properties are dynamic properties and help derive values from a database or another persistent store like a cache. 

Computed Properties are similar to [Data Properties](/v2-1/essentials/properties.md) with some key differences:

* They are declared as inline functions using `computed`.
* They can return any CFML value or object.

## Defining Properties

Define Computed Properties in your [Wires](/v2-1/essentials/creating-components.md) using `computed`. 

```javascript
component extends="cbwire.models.Component" {

    property name="taskService" inject="taskService@myapp";

    // Computed Properties
    computed = {
        "allTasks": function() {
            return taskService.getAll();
        }
    };
}

```

## Accessing From Actions

You can access your Computed Properties from within your [Actions](/v2-1/essentials/actions.md) using `computed.[propertyName]()`.

```javascript
component extends="cbwire.models.Component" {

    // Computed Properties
    computed = {
        "allTasks": function() {
            // return something here
        }
    };

    // Action
    function deleteTasks() {      

        if ( arrayLen( computed.allTasks() ) {
            taskService.deleteAll();
        }

    }
}
```

## Accessing From Templates

You can access Computed Properties in your [Template](#templates) using `args.computed.[computedProperty]()`.

```html
<cfoutput>
<div>
    <ul>
        <cfloop array="#args.computed.allTasks()#" index="task">
            <li>#task#</li>    
        </cfloop>
    </ul>
</div>
</cfoutput>
```


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