dict_assign_key_values: Assigne key and value to fast dictionary

In wagnius-GmbH/slvwagner: All Stuff that I`m Missing

Assigne key and value to fast dictionary

Description

The reason for using dictionaries in the first place is performance. Although it is correct that you can use named vectors and lists for the task, the issue is that they are becoming quite slow and memory hungry with more data. Yet what many people don't know is that R has indeed an inbuilt dictionary data structure environments with the option hash = TRUE

Usage

dict_assign_key_values(
  x,
  value,
  pos = -1,
  envir = as.environment(pos),
  inherits = FALSE,
  immediate = TRUE
)

Arguments

x	key (character)
value	value (character)
pos	= -1
envir	= as.environment(pos)
inherits	= FALSE
immediate	= TRUE

Details

https://blog.ephorie.de/hash-me-if-you-can

Value

Environment hashed, that can be used as fast dictionary.

Author(s)

Florian Wagner [e-mail]

Examples

df <- data.frame(key   = c("ch","se","de","it"),
                 value = c(41L,46L,49L,39L))
# initialize hash
hash = dict_init(nrow(df))
# Assign key and values
dict_assign_key_values(df$key, df$value, hash)
dict_get_values(c("ch", "it"), hash)

wagnius-GmbH/slvwagner documentation built on Jan. 19, 2025, 7:10 a.m.