Examples for 'rlang::eval_tidy'

### ** Examples


# With simple defused expressions eval_tidy() works the same way as
# eval():
fruit <- "apple"
vegetable <- "potato"
expr <- quote(paste(fruit, vegetable, sep = " or "))
expr

eval(expr)

eval_tidy(expr)

# Both accept a data mask as argument:
data <- list(fruit = "banana", vegetable = "carrot")
eval(expr, data)

eval_tidy(expr, data)

# The main difference is that eval_tidy() supports quosures:
with_data <- function(data, expr) {
  quo <- enquo(expr)
  eval_tidy(quo, data)
}
with_data(NULL, fruit)

with_data(data, fruit)

# eval_tidy() installs the `.data` and `.env` pronouns to allow
# users to be explicit about variable references:
with_data(data, .data$fruit)

with_data(data, .env$fruit)