new-hash - (hash)
Contents
Description
new-hash creates new <hash>. A hash is a collection of key/value pairs, called "elements". A value of an
element is obtained based on its key value.
SCOPE
Note that a hash is accessible to the current request only, unless "process-scope" clause is used, in
which case all requests served by a process can use it (see do-once for a typical way to create a hash
with a process scope).
If "process-scope" is used, then <hash> will keep its data across all requests in a given process. See
write-hash for an example of a process-scoped hash.
SIZINGAHASH
A hash can be of any size, as long as there is enough memory for it. The "hash-size" refers to the size
of a hash table used to provide high-performance access to its elements based on a key.
<hash size> is the number of "buckets" used by the hash (it is 10 by default). All hash elements with the
same hash code are stored in a linked list within the same bucket. Greater <hash size> generally means
less elements per bucket and better performance. However, memory usage grows with a bigger hash table, so
<hash size> should be balanced based on the program needs.
Golf uses high-performing FNV1_a hash algorithm. Each element in a bucket list is lightweight, containing
pointers to a key, value and next element in the linked list.
<hash size> must be at least 256; if less, it will be set to 256.
Examples
Create a new hash with 5000 buckets:
new-hash h hash-size 5000
See read-hash for more examples.
Name
new-hash - (hash)
Purpose
Create hash.
See Also
Hash
get-hashnew-hashpurge-hashread-hashresize-hashwrite-hash See all documentation
$DATE $VERSION GOLF(2gg)
Syntax
new-hash <hash> \
[ process-scope ] \
[ hash-size <hash size> ]
