Purports to be a simple key -> value lookup table. Known as a 'Dictionary' in some circles. It attempts to optimize for speed of lookup by choosing different storage models.
- Bugs and Limitations
- Version history
dict-safe-mode[parameter] (dict-safe-mode [FLAG #f])
Sets or gets the safe execution mode.
Enables or disables argument validation. Also literal object return.
make-dict[procedure] (make-dict [EQUALITY eq?] [ESTIMATE <small-number>])
Returns a dictionary using the supplied EQUALITY test, optimized for the number of elements ESTIMATE.
alist->dict[procedure] (alist->dict ALIST [EQUALITY eq?] [ESTIMATE 0])
Returns a dictionary constructed from ALIST using the supplied EQUALITY test, and optional ESTIMATE.
dict?[procedure] (dict? OBJECT)
Is the OBJECT a dictionary?
dict-equivalence-function[procedure] (dict-equivalence-function DICT)
Returns the equality test predicate procedure for DICT.
dict-count[procedure] (dict-count DICT)
Returns the number of items in the DICT.
dict-keys[procedure] (dict-keys DICT)
Returns the keys in the DICT.
dict-values[procedure] (dict-values DICT)
Returns the values in the DICT.
dict->alist[procedure] (dict->alist DICT)
Returns the DICT as an association list. The result may not be mutated!
dict-ref[procedure] (dict-ref DICT KEY [DEFAULT #f])
Returns the value associated with KEY in the DICT, otherwise DEFAULT.
dict-exists?[procedure] (dict-exists? DICT KEY)
Does an entry with KEY exist in the DICT ?
dict-set![procedure] (dict-set! DICT KEY VALUE)
Associate VALUE with KEY in the DICT.
VALUE must not be (code (void)) !
dict-update![procedure] (dict-update! DICT KEY DEFAULT-VALUE-PROCEDURE [FUNC identity])
Invokes FUNC on either the existing value for KEY in the DICT, or the result of the DEFAULT-VALUE-PROCEDURE when no existing value. The result then becomes the value for KEY in the DICT.
Returns the updated value for KEY in the DICT.
DEFAULT-VALUE-PROCEDURE must not return (code (void)) !
dict-update-list![procedure] (dict-update-list! DICT KEY [OBJECT]...)
Updates the value for KEY in the DICT with a list of OBJECT.
dict-update-dict![procedure] (dict-update-dict! DICT KEY)
Updates the value for KEY in the DICT with a dictionay.
dict-delete![procedure] (dict-delete! DICT KEY)
Removes any association of KEY in the DICT.
dict-for-each[procedure] (dict-for-each DICT (PROCEDURE (-> KEY VALUE <ignored>)))
Invokes the supplied PROCEDURE with each association in the DICT.
dict-merge![procedure] (dict-merge! DICT [DICT-1...])
Returns the DICT as the union of ( DICT DICT-1 ...) using overwrite semantics.
Tables must have the same equality predicate.
dict-search[procedure] (dict-search DICT (PROCEDURE (-> object object boolean)) [DEFAULT #f])
Accepts a PROCEDURE of two arguments, key and value. When the procedure returns (code #t) this procedure returns the value. Otherwise the DEFAULT value is returned.)
dict-print[procedure] (dict-print DICT [PORT (current-output-port)])
Pretty-print DICT to PORT.
Bugs and Limitations
- Removed backward compatibility for 'make-dict' argument order.
- Replaced dict-unsafe-mode with dict-safe-mode. The update operations now rebind storage model.
- Added 'dict-keys', 'dict-values'
- Uses 'misc-extn' 3.0
- Added dict-exists?, dict-unsafe-mode
- Added update procedures
- Changed argument order for 'make-dict'
- Needs misc-extn > 2.0
- Added search, count
- Initial release
Copyright (C) 2009 Kon Lovett. All rights reserved.
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