Struct VarDeclaration 

pub struct VarDeclaration(pub VariableList);

A var statement, also called VariableStatement in the spec.

The scope of a variable declared with var is its current execution context, which is either the enclosing function or, for variables declared outside any function, global. If you re-declare a ECMAScript variable, it will not lose its value.

Although a bit confusing, VarDeclarations are not considered Declarations by the spec. This is partly because it has very different semantics from let and const declarations, but also because a var statement can be labelled just like any other Statement:

label: var a = 5;
a;

returns 5 as the value of the statement list, while:

label: let a = 5;
a;

throws a SyntaxError.

var declarations, wherever they occur, are processed before any code is executed. This is called hoisting.

Tuple Fields

0: VariableList

Trait Implementations

impl Clone for VarDeclaration

fn clone(&self) -> VarDeclaration

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VarDeclaration

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for VarDeclaration

fn deserialize<__D>( __deserializer: __D, ) -> Result<VarDeclaration, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a> From<&'a VarDeclaration> for NodeRef<'a>

fn from(node: &'a VarDeclaration) -> NodeRef<'a>

Converts to this type from the input type.

impl<'a> From<&'a mut VarDeclaration> for NodeRefMut<'a>

fn from(node: &'a mut VarDeclaration) -> NodeRefMut<'a>

Converts to this type from the input type.

impl From<VarDeclaration> for ForLoopInitializer

fn from(list: VarDeclaration) -> ForLoopInitializer

Converts to this type from the input type.

impl From<VarDeclaration> for Statement

fn from(var: VarDeclaration) -> Statement

Converts to this type from the input type.

impl PartialEq for VarDeclaration

fn eq(&self, other: &VarDeclaration) -> 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 Serialize for VarDeclaration

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ToInternedString for VarDeclaration

fn to_interned_string(&self, interner: &Interner) -> String

Converts a given element to a string using an interner.

impl VisitWith for VarDeclaration

fn visit_with<'a, V>( &'a self, visitor: &mut V, ) -> ControlFlow<<V as Visitor<'a>>::BreakTy>

where V: Visitor<'a>,

Visit this node with the provided visitor.

fn visit_with_mut<'a, V>( &'a mut self, visitor: &mut V, ) -> ControlFlow<<V as VisitorMut<'a>>::BreakTy>

where V: VisitorMut<'a>,

Visit this node with the provided visitor mutably, allowing the visitor to modify private fields.

impl StructuralPartialEq for VarDeclaration