# Specifying Priority

Priority allows some listeners to be called prior to the others when the event occurs. The smaller number, the higher priority. If priority is not specified, `Priority.MEDIUM` will be used by default.

```javascript
const { Priority } = require('robo-toolkit').event;

/** possible values:
    Priority.HIGEST: Number.MIN_SAFE_INTEGER
    Priority.HIGER: -2
    Priority.HIGH: -1
    Priority.MEDIUM: 0
    Priority.LOW: 1
    Priority.LOWER: 2
    Priority.LOWEST: Number.MAX_SAFE_INTEGER
*/

// usage
aggregator
    .get('some event')
    .priority(Priority.HIGH)
    .add(listener);
```

You can use any number you want as Priority rather than predefined ones. Below is an example:

```javascript
aggregator
    .get('some event')
    .priority(10)
    .add(() => {
        console.log('My priority: 10');
    });

aggregator
    .get('some event')
    .priority(5)
    .add(() => {
        console.log('My priority: 5');
    });

aggregator
    .get('some event')
    .dispatch();
```

Output in console will look like:

```
My priority: 5
My priority: 10
```
