On 01/09/2013 11:18 AM, Frank Church wrote:
>
> When I print it returns an empty array #(), but I expect to get subset
> of TextMorphForEditView allInstances.
>
> What is the likely purpose of the notNil?
>
> --
> Frank Church

The #firstOwnerSuchThat: method either returns the morph that meets the
criteria specified in the block sent to it (in this instance that the
owner is a SystemWindow and its model is a Workspace) or nil. �The
#select: block needs the code inside it to return a boolean, so the
#notNil converts the response from the #firstOwnerSuchThat: method into
a boolean rather than leaving it as either nil or the morph.


If you right click on a method and choose Implementors you can see how
each class that implements the method defines it. �You can also right
click the method and choose Senders to see examples of how the method is
used.