Hash Table and Hash Set

The hashtable packages provides three implementations of hash tables and hash maps:

  1. using std::unordered_map and std::unordered_set from C++, in functions hash_table() and hash_set(),
  2. using the fastmatch package, in functions hash_fm_table() and hash_fm_set(),
  3. using environment, in functions hash_env_table() and hash_env_set().

They share the same user interface.

Install

library(devtools)
# install_github("jokergoo/hashtable")
install.packages("hashtable", repos = c('https://jokergoo.r-universe.dev', 'https://cloud.r-project.org'))

Usage

Hash table

library(hashtable)
h1 = hash_table(letters, 1:26)
h2 = hash_fm_table(letters, 1:26)
h3 = hash_env_table(letters, 1:26)
h1
## A hash table [hash_unordered_map] with 26 key-value (integer) pairs
##   v => 22
##   u => 21
##   z => 26
##   ......
##   b => 2
##   w => 23
##   a => 1

Hash set

h1 = hash_set(letters)
h2 = hash_fm_set(letters)
h3 = hash_env_set(letters)
h1
## A hash set [hash_unordered_set] with 26 keys (character)

Benchmark

See https://jokergoo.github.io/hashtable/articles/benchmark.html.

License

MIT @ Zuguang Gu