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--- status: DRAFT
--- author(s): L.Gold, Lily Silverstein
--- notes:
doc ///
Key
applyKeys
(applyKeys, HashTable, Function)
(applyKeys, HashTable, Function, Function)
Headline
apply a function to each key in a hash table
Usage
applyKeys(H, f)
applyKeys(H, f, g)
Inputs
H:HashTable
f:Function
of one argument
g:Function
of two arguments, for collision handling
Outputs
:HashTable
obtained by applying {\tt f} to each key in {\tt H}
Caveat
It is an error for the function {\tt f} to return two pairs with the same key.
When this is a possibility, use the function {\tt g} to specify how the two
pairs should be reconciled.
Description
Example
H = new HashTable from {1 => 10, 2 => 15, 3 => 20}
applyKeys(H, k -> k + 100)
applyKeys(H, k -> k//2, max)
applyKeys(H, k -> k//2, plus)
SeeAlso
"hash tables"
applyPairs
applyValues
keys
scanKeys
///
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