Base type of an object
This is equivalent to base::typeof()
with a few differences that
make dispatching easier:
The type of one-sided formulas is "quote".
The type of character vectors of length 1 is "string".
The type of special and builtin functions is "primitive".
type_of(x)
x |
An R object. |
type_of()
is an experimental function. Expect API changes.
type_of(10L) # Quosures are treated as a new base type but not formulas: type_of(quo(10L)) type_of(~10L) # Compare to base::typeof(): typeof(quo(10L)) # Strings are treated as a new base type: type_of(letters) type_of(letters[[1]]) # This is a bit inconsistent with the core language tenet that data # types are vectors. However, treating strings as a different # scalar type is quite helpful for switching on function inputs # since so many arguments expect strings: switch_type("foo", character = abort("vector!"), string = "result") # Special and builtin primitives are both treated as primitives. # That's because it is often irrelevant which type of primitive an # input is: typeof(list) typeof(`$`) type_of(list) type_of(`$`)
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