hash-table-update![procedure] hash-table-update! hash-table key function [thunk]
SRFI-69: Semantically equivalent to, but may be implemented more efficiently than, the following code:
(hash-table-set! hash-table key
(function (hash-table-ref hash-table key thunk)))
[procedure] hash-table-update! hash key update-fun init-value
STklos: update the entry of hash table hash associated with key.
See make-hash-table.
See also Concept:HashTable.
R6RS has hashtable-update!.
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