Struct r::callable::primitive::PrimitiveNames

pub struct PrimitiveNames;

Get Names of an Object

Returns the element names for vector-like objects, or names of symbols assigned in environments.

In-Language

Usage

names(x)

Arguments

• x: An object from which to retrieve names

Examples

Accessing the names of elements in a list

names((a = 1, b = 2, c = 3))

Unlike R, names() will always return a character vector, even if no element is named.

names((1, 2, 3))

Accessing names in an environment

x <- 3; y <- 4
names(environment())

Trait Implementations

impl Builtin for PrimitiveNames

fn kind(&self) -> SymKind

fn is_transparent(&self) -> bool

fn is_infix(&self) -> bool

impl Callable for PrimitiveNames

fn call_matched( &self, args: List, _ellipsis: List, stack: &mut CallStack, ) -> EvalResult

fn match_args( &self, args: List, stack: &mut CallStack, ) -> Result<(List, List), Signal>

fn match_arg_exprs( &self, args: ExprList, stack: &mut CallStack, ) -> Result<(List, List), Signal>

fn call(&self, args: ExprList, stack: &mut CallStack) -> EvalResult

fn call_mut(&self, args: ExprList, stack: &mut CallStack) -> EvalResult

fn call_assign( &self, value: Expr, args: ExprList, stack: &mut CallStack, ) -> EvalResult

impl CallableClone for PrimitiveNames

where Self: Callable,

fn callable_clone(&self) -> Box<dyn Builtin>

impl CallableFormals for PrimitiveNames

fn formals(&self) -> ExprList

impl Clone for PrimitiveNames

fn clone(&self) -> PrimitiveNames

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PrimitiveNames

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for PrimitiveNames

fn eq(&self, other: &PrimitiveNames) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Sym for PrimitiveNames

const SYM: &'static str = "names"

const KIND: &'static SymKind = _

impl StructuralPartialEq for PrimitiveNames