Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Debugging
Fixing Performance Warnings
Reference
Component Library (Beta)
Supported aura:attribute Types
Basic Types
Function Type
Object Types
Standard and Custom Object Types
Collection Types
Custom Apex Class Types
Framework-Specific Types
System Tag Reference
Component Reference
Messaging Component Reference
Interface Reference
Event Reference
System Event Reference
Supported HTML Tags
PDF

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Object Types

An attribute can have a type corresponding to an Object. For example:

1<aura:attribute name="data" type="Object" />

We recommend using type="Map" instead of type="Object" to avoid some deserialization issues on the server. For example, when an attribute of type="Object" is serialized to the server, everything is converted to a string. Deep expressions, such as v.data.property can throw an exception when they are evaluated as a string on the server. Using type="Map" avoids these exceptions for deep expressions, and other deserialization issues.

Warning

Checking for Types

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.