predicater | Ricardo Semião

There are three types (typeof()) of functions in R: "closure" (standard functions), or "builtin"/"special" (primitive, special functions). See rlang::is_function() for more details on their difference.

rlang::is_function() tests for any function type.
rlang::is_closure() tests for closures.
rlang::is_primitive() tests for "builtin" or "special".
rlang::is_primitive_eager() tests for "builtin".
rlang::is_primitive_lazy() tests for "special".

Usage

is_function(x)

is_closure(x)

is_primitive(x)

is_primitive_eager(x)

is_primitive_lazy(x)

Arguments

x: [any] An object to test.

Value

[TRUE | FALSE] The scalar result of the test.

Type checks - Functions

Usage

Arguments

Value