var_is_a: Test that the value of the expression is of a specific class.

In swirldev/swirl: Learn R, in R

Description

Returns TRUE if a variable of the given name exists in the global environment and is of the given class.

Usage

var_is_a(class, var_name)

Arguments

class	expected class which the given variable
var_name	name of the variable

Value

TRUE or FALSE

See Also

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

Examples

## Not run: 
# Test that a variable named "x" in the global environmentis numeric.
var_is_a('numeric', 'x')

## End(Not run)

swirldev/swirl documentation built on Jan. 17, 2020, 6:28 p.m.