An attribute can have a type corresponding to an Object.
<aura:attribute name="data" type="Object" />
For example, you may want to create an attribute of type Object to pass a JavaScript array as an event parameter. In the component event, declare the event parameter using aura:attribute.
<aura:event type="COMPONENT"> <aura:attribute name="arrayAsObject" type="Object" /> <aura:event>
In JavaScript code, you can set the attribute of type Object.
// Set the event parameters var event = component.getEvent(eventType); event.setParams({ arrayAsObject:["file1", "file2", "file3"] }); event.fire();
To determine a variable type, use typeof or a standard JavaScript method instead. The instanceof operator is unreliable due to the potential presence of multiple windows or frames.