class Prism::ImplicitRestNode

Represents using a trailing comma to indicate an implicit rest parameter.

foo { |bar,| }
          ^

foo in [bar,]
           ^

for foo, in bar do end
       ^

foo, = bar
   ^

Public Class Methods

new(location) click to toggle source

def initialize: (location: Location) -> void

# File prism/node.rb, line 8052
def initialize(location)
  @location = location
end

type() click to toggle source

Similar to type, this method returns a symbol that you can use for splitting on the type of the node without having to do a long === chain. Note that like type, it will still be slower than using == for a single class, but should be faster in a case statement or an array comparison.

def self.type: () -> Symbol

# File prism/node.rb, line 8121
def self.type
  :implicit_rest_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File prism/node.rb, line 8057
def accept(visitor)
  visitor.visit_implicit_rest_node(self)
end

child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File prism/node.rb, line 8062
def child_nodes
  []
end

Also aliased as: deconstruct

comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File prism/node.rb, line 8072
def comment_targets
  []
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File prism/node.rb, line 8067
def compact_child_nodes
  []
end

copy(**params) click to toggle source

def copy: (**params) -> ImplicitRestNode

# File prism/node.rb, line 8077
def copy(**params)
  ImplicitRestNode.new(
    params.fetch(:location) { location },
  )
end

deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

# File prism/node.rb, line 8087
def deconstruct_keys(keys)
  { location: location }
end

inspect(inspector = NodeInspector.new) click to toggle source

def inspect(inspector: NodeInspector) -> String

# File prism/node.rb, line 8092
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector.to_str
end

type() click to toggle source

Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling ‘[cls1, cls2].include?(node.class)` or putting the node into a case statement and doing `case node; when cls1; when cls2; end`. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.

Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.

def type: () -> Symbol

# File prism/node.rb, line 8111
def type
  :implicit_rest_node
end