expr_is_a: Test that the expression itself is of a specific 'class'.

In swirldev/swirl: Learn R, in R

Description

Returns TRUE if e$expr is of the given class.

Usage

expr_is_a(class)

Arguments

class

expected class of the given expression

Value

TRUE or FALSE

See Also

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

Examples

## Not run: 
# Test if the expression entered by a user is an assignment
#
expr_is_a('<-')

## End(Not run)

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