swirl (version 2.2.21)

expr_creates_var: Test that a new variable has been created.

Description

Tests if the e$expr creates one new variable (of correct name if given.) If so, returns TRUE.

Usage

expr_creates_var(correctName = NULL)

Arguments

correctName

expected name of the new variable or NULL

Value

• TRUE or FALSE

See Also

Other AnswerTests: AnswerTests; any_of_exprs; expr_identical_to; expr_is_a; expr_uses_func; func_of_newvar_equals; omnitest; val_has_length; val_matches; var_is_a

Examples

# Test if the user has entered an expression which creates
# a new variable of any name.
expr_creates_var()
#
# Test if the user has entered an expression which creates
# a variable named 'myNum'
#
expr_creates_var('myNum')