Enum Builtin 

pub enum Builtin {
    Length,
    Count,
    IsEmpty,
    IsNull,
    Contains,
    StartsWith,
    EndsWith,
}

The closed catalog of pure builtins (§Fase 70.c). All are total + pure. Collection/string predicates only; the predicate-taking folds (any/all/ none) need lambdas and are deferred, as are sum/min/max and in/??.

Variants

Length

.length — collection element count, or character count of a string.

Count

.count — alias of length.

IsEmpty

.is_empty — length == 0.

IsNull

.is_null — the value is absent / empty / null.

Contains

.contains(x) — array membership, or string substring.

StartsWith

.starts_with(s) — string prefix test.

EndsWith

.ends_with(s) — string suffix test.

Implementations

impl Builtin

pub fn extra_arity(self) -> usize

The number of arguments AFTER the receiver (args[0]).

pub fn surface(self) -> &'static str

The surface name (after the .).

pub fn from_name(name: &str) -> Option<Builtin>

Resolve a name (after a .) to a builtin, or None if it is an ordinary field / path segment.

Trait Implementations

impl Clone for Builtin

fn clone(&self) -> Builtin

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Builtin

impl Debug for Builtin

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

Formats the value using the given formatter.

impl Eq for Builtin

impl PartialEq for Builtin

fn eq(&self, other: &Builtin) -> 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 StructuralPartialEq for Builtin