memofunc (version 1.0.2)

storage.unset: Unset a value that corresponds to a key within a store.

Description

Unsets the value stored for a given key.

If there is no value for the key provided no action is taken.

Usage

storage.unset(storage, key)

Arguments

storage

initialized storage

key

key whose value is to be unset

Value

Invisibily returns storage

Examples

Run this code
# NOT RUN {
library(magrittr)

# initialize default memory storage
my.storage <- storage.init()

# set a value into storage
storage.set(my.storage, "name", "Roy Wetherall")

# .. and some more
my.storage %>% 
  storage.set("age", 45) %>% 
  storage.set("alive", TRUE) %>%
  storage.set("children", c("Peter", "Grace", "Lucy"))

# check a key has been set
if (storage.has(my.storage, "name")) print("I know your name!")

# .. and that a key hasn't been set
if (!storage.has(my.storage, "address")) print("I don't know where you live!")

# get some values from storage
sprintf(
  "%s is %i years old.", 
  storage.get(my.storage, "name"),
  storage.get(my.storage, "age"))

# remove a value from storage
storage.unset(my.storage, "children")

# .. and show it's not there anymore
if (!storage.has(my.storage, "address")) print("I don't know who your children are!")

# clear all values from storage
storage.clear(my.storage)

# .. and everything is gone
if (!storage.has(my.storage, "name") && !storage.has(my.storage, "age")) print("I know nothing!")
# }

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