teal.code (version 0.6.0)

qenv: Instantiates a qenv environment

Description

Instantiates a qenv environment.

Usage

qenv()

Value

qenv environment.

Details

qenv class has following characteristics:

• It inherits from the environment and methods such as $, get(), ls(), as.list(), parent.env() work out of the box.

• qenv is a locked environment, and data modification is only possible through the eval_code() and within.qenv() functions.

• It stores metadata about the code used to create the data (see get_code()).

• It supports slicing (see subset-qenv)

• It is immutable which means that each code evaluation does not modify the original qenv environment directly. See the following code:

  q1 <- qenv()
  q2 <- eval_code(q1, "a <- 1")
  identical(q1, q2) # FALSE
  

See Also

eval_code(), get_var(), subset-qenv, get_env(),get_warnings(), join(), concat()

Examples

q <- qenv()
q2 <- within(q, a <- 1)
ls(q2)
q2$a