UndefinedObject documentation

# UndefinedObject

UndefinedObject inherits from Object and defines no instance variables. It has no subclasses.

UndefinedObject is the class of nil.

## Methods defined in UndefinedObject:

### Methods for copying:

- shallowCopy

### Methods for predicates:

- isNil
- notNil

### Methods for printing:

- printOn: stream

### Methods for system operations:

- orIfNil: block

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