expr_uses_func: Test that a particular function has been used.

In swirl: Learn R, in R

Description

Returns TRUE if the e$expr uses the function whose name is given as the first argument.

Usage

expr_uses_func(func)

Arguments

func	name of the function expected to be used

Value

TRUE or FALSE

See Also

Other AnswerTests: AnswerTests, any_of_exprs(), calculates_same_value(), expr_creates_var(), expr_identical_to(), expr_is_a(), func_of_newvar_equals(), omnitest(), val_has_length(), val_matches(), var_is_a()

Examples

## Not run: 
# Test that the user has entered an expression using sd()
#
expr_uses_func('sd')

## End(Not run)

swirl documentation built on Jan. 16, 2020, 5:03 p.m.