dict: Dict

In skubicius/dictionary: Hashmap Data Structure

Description

Creates a dict object from the supplied arguments.

A dict can be create from named arguments, named lists, environments, or vectors of keys and values.

Usage

dict(...)

Arguments

...	Objects, possibly named.

Value

Object of class dict.

See Also

items

Examples

# Basic use:
d <- dict(a = 1, b = 2)
d$size()
d$has_key("a")
d$has_key("c")

# From a named list
d <- dict(list(chr = "name", bool = TRUE))
d$get("chr")
d$get("char", default = "missing")
d$set("char", "now i exist")
d$get("char", default = "missing")

# Updating dict
d <- dict(one = 1L)
other <- dict(two = 2L, PI = 3.14)
d$update(other)
d

# Creating from keys and values vectors
# These can be named explicitly, otherwise the first one
# is considered keys and the second, values
d <- dict(letters, seq_along(letters))

# Iterating through dict (will print the key with value 10, i.e. "j")
for (item in d$items()) {
  if (item$value == 10)
    print(item$key)
}

# Extracting values
d <- dict(x = 1, y = 2)
d["x"]
d["z"] <- 3

# Vectorized assignments
new_keys <- c("one", "two")
new_vals <- c(1, 2)
d[new_keys] <- new_vals

# Vectorized extractions
keys_to_extract <- c("x", "two")
d[keys_to_extract]

skubicius/dictionary documentation built on May 7, 2019, 7:17 p.m.