# Property

#### abstract new Cesium.Property()
engine/Source/DataSources/Property.js 20

The interface for all properties, which represent a value that can optionally vary over time. This type defines an interface and cannot be instantiated directly.

##### See:

- CompositeProperty
- ConstantProperty
- SampledProperty
- TimeIntervalCollectionProperty
- MaterialProperty
- PositionProperty
- ReferenceProperty

### Members

#### readonly definitionChanged : Event
engine/Source/DataSources/Property.js 45

Gets the event that is raised whenever the definition of this property changes. The definition is considered to have changed if a call to getValue would return a different result for the same time.

#### readonly isConstant : boolean
engine/Source/DataSources/Property.js 33

Gets a value indicating if this property is constant. A property is considered constant if getValue always returns the same result for the current definition.

### Methods

#### equals(other) → boolean
engine/Source/DataSources/Property.js 68

Compares this property to the provided property and returns `true` if they are equal, `false` otherwise.

Name | Type | Description
--- | --- | ---
`other` | Property | optional The other property.

##### Returns:

`true` if left and right are equal, `false` otherwise.

#### getValue(time, result) → object
engine/Source/DataSources/Property.js 58

Gets the value of the property at the provided time.

Name | Type | Default | Description
--- | --- | --- | ---
`time` | JulianDate | `JulianDate.now()` | optional The time for which to retrieve the value. If omitted, the current system time is used.
`result` | object |  | optional The object to store the value into, if omitted, a new instance is created and returned.

##### Returns:

The modified result parameter or a new instance if the result parameter was not supplied.

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