Function contains

contains(shapeType, expectedType): boolean
Checks if the given shape type matches the expected type.
Parameters
- shapeType: ShapeType
  the type of the shape
- expectedType: ShapeType
  the expected type
Returns boolean
true if the given shape type is of the expected shape type, false otherwise
```
var polygon = new ...
ShapeType.contains(polygon.type, ShapeType.POLYGON); //true
```