dictnary(3) UNIX System V (Apr 20, 1999) dictnary(3)
Dictionary
Inherits from:
Object
Class Description
Dictionaries (instances of the Dictionary class) are key-
value tables : to each key object, a value object is
associated. The key can then be used to access the
corresponding value. There are a few special provisions for
tables with String instances as keys.
Method types
Creation
* new
* copy
* deepCopy
* emptyYourself
* freeContents
* freeAll
* free
Interrogation
* size
* isEmpty
* includesKey:
Comparing
* hash
* isEqual:
Indexed Access
* atKey:
* atKey:ifAbsent:
* atKeySTR:
* atKey:put:
* atKeySTR:put:
* eachKey
* eachValue
Blocks
* keysDo:
Printing
* printOn:
Methods
new
+ new
Returns a new empty dictionary.
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copy
- copy
Returns a new copy of the dictionary.
deepCopy
- deepCopy
Returns a new copy of the dictionary. The members in the
new dictionary are deep copies of the members in the
original dictionary.
emptyYourself
- emptyYourself
Removes all the keys and values of the dictionary (without
freeing them). Returns the receiver.
freeContents
- freeContents
This method is, in the case of the Dictionary class,
equivalent to emptyYourself . Note that for the sake of
Stepstone ICpak101 compatibility, this method does not free
keys and values. Use freeAll for that.
freeAll
- freeAll
This method frees all the keys and values in the dictionary,
without freeing the dictionary itself. Returns the
dictionary.
Note:
This method is ObjectPak specific.
free
- free
Frees the dictionary, but not its contents. Returns nil .
Do :
aDic = [[aDic freeAll] free];
if you want to free the dictionary and its contents.
size
- ( unsigned ) size
Returns the number of key-value associations in the
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dictionary.
isEmpty
- ( BOOL ) isEmpty
Whether the number of associations in the dictionary is
equal to zero.
includesKey:
- ( BOOL ) includesKey : aKey
Returns YES if there is an association with key matching
aKey .
hash
- ( unsigned ) hash
Returns a hash value based on the receiver's address and the
results of sending the hash message to the contents.
isEqual:
- ( BOOL ) isEqual : aDic
Returns YES if aDic is a dictionary, and if its keys and
values respond affirmatively to the message isEqual: when
compared to the corresponding objects of the receiver's
contents.
atKey:
- atKey : aKey
Returns the value of the association matching aKey .
Returns nil if the association is not found.
atKey:ifAbsent:
- atKey : aKey ifAbsent : exceptionBlock
Returns the value of the association matching aKey .
Evaluates exceptionBlock and returns its return value, if
the association is not found.
atKeySTR:
- atKeySTR :(STR) strKey
Returns the value of the association matching strKey .
Returns nil if the association is not found.
atKey:put:
- atKey : aKey put : anObject
Associates aKey to anObject . Adds the objects to the
dictionary. If aKey was already in the dictionary, makes
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anObject the value for this key and returns the old value.
Otherwise returns nil .
atKeySTR:put:
- atKeySTR :(STR) strKey put : anObject
Associates strKey to anObject . Adds the objects to the
dictionary. If strKey was already in the dictionary, makes
anObject the value for this key and returns the old value.
Otherwise returns nil .
eachKey
- eachKey
Returns a sequence of the key objects in the dictionary.
keys = [aDic eachKey];
while ((aKey = [aSeq next])) {
/* do something */
}
keys = [keys free];
See also:
eachValue
eachValue
- eachValue
Returns a sequence of the value objects in the dictionary.
keys = [aDic eachKey];
values = [aDic eachValue];
while ((aKey = [aSeq next])) {
aValue = [values next];
/* do something */
}
keys = [keys free];
values = [values free];
See also:
eachKey
keysDo:
- keysDo : aBlock
The keysDo: message iterates through all the Dictionary
elements, running a one-argument block of code specified by
the aBlock argument with the argument set to the key of each
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assocation.
printOn:
- printOn :(IOD) aFile
Prints a comma separated list of the key-value pairs by
sending each individual object a printOn: message. Returns
the receiver.
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