Glossary
- edition
- In VisualAge, a software component that is subject to further
change. A software component can have one or more editions, identified
by a time stamp stating the date and time of the edition's
creation. Many changes can be made to a single edition of a
class. In contrast, every change to a method creates a new edition of
that method. In its broadest sense, edition can include
scratch edition and version.
- encapsulation
- The hiding of a software object's internal data
representation. The object provides an interface that queries and
manipulates the data without exposing its underlying structure.
- enterprise server
- An environment in which client/server applications can run.
Enterprise server computers are owned, operated, and programmed by management
information systems (MIS) organizations that control and protect the data
assets of large business enterprises.
- evaluate
- To process a selected expression or group of expressions, and return the
result. The Execute and Display operations are common ways of
evaluating Smalltalk expressions.
- event
- In VisualAge, a representation of a change that occurs to a part.
The events on a part's public interface enable other interested parts to
receive notification when something about the part changes. For
example, a push button generates an event signaling that it has been clicked,
which may cause another part to display a window. Compare to
action and attribute.
- event handler
- In the Common Widgets subsystem, a method that is executed as a result of
the user performing some action on the user interface. See also
callback method.
- event-to-action connection
- A connection that causes an action to be performed when an event
occurs. See also connection.
- event-to-script connection
- A connection that causes a script to run when an event occurs. See
also connection.
- expression
- In Smalltalk, the syntactic representation of one or more messages.
An expression can consist of subexpressions representing the receiver and
arguments of the message. The expression can also cause the assignment
of its result to one or more variables.
- extended class
- An class that uses and extends the behavior of a class defined by another
application. It consists of one or more methods that define the added
behavior. These methods cannot modify the existing behavior of the
defined class; they can add only behavior specific to the application
that contains the extended class. Contrast with defined
class.
- extended widget
- In the Common Widgets subsystem, a custom widget based on an existing
widget.
- external source
- The format of Smalltalk source code that is filed out to an external
file. See also File In and File Out.
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