Evaluate expressions

Usage

eval_dirty(expr, env = parent.frame(), data = NULL, quoted = TRUE)

Arguments

expr: R expression or 'rlang' quo
env: environment to evaluate
data: dataframe or list
quoted: Is the expression quoted? By default, this is TRUE. This is useful when you don't want to use an expression that is stored in a variable; see examples

Value

the executed results of expr evaluated with side effects.

Details

eval_dirty uses base::eval() function to evaluate expressions. Compare to rlang::eval_tidy, which won't affect original environment, eval_dirty causes changes to the environment. Therefore if expr contains assignment, environment will be changed in this case.

Examples


env = new.env(); env$a = 1
rlang::eval_tidy(quote({a <- 111}), env = env)
print(env$a)  # Will be 1. This is because eval_tidy has no side effect
#> [1] 1

eval_dirty(quote({a <- 111}), env)
print(env$a)  # 111, a is changed
#> [1] 111

# Unquoted case
eval_dirty({a <- 222}, env, quoted = FALSE)
print(env$a)
#> [1] 222