swirl (version 2.4.1)

expr_uses_func: Test that a particular function has been used.

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

# Test that the user has entered an expression using sd()
#
expr_uses_func('sd')