Represents using a lambda literal (not the lambda method call).
->(value) { value * 2 }
^^^^^^^^^^^^^^^^^^^^^^^
attr_reader parameters: Prism::node?
attr_reader body: Prism::node?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11693
def initialize(source, locals, operator_loc, opening_loc, closing_loc, parameters, body, location)
@source = source
@location = location
@locals = locals
@operator_loc = operator_loc
@opening_loc = opening_loc
@closing_loc = closing_loc
@parameters = parameters
@body = body
end
def initialize: (Array locals, Location operator_loc, Location opening_loc, Location closing_loc, Prism::node? parameters, Prism::node? body, Location location) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11814
def self.type
:lambda_node
end
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 tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11820
def ===(other)
other.is_a?(LambdaNode) &&
(locals.length == other.locals.length) &&
locals.zip(other.locals).all? { |left, right| left === right } &&
(operator_loc.nil? == other.operator_loc.nil?) &&
(opening_loc.nil? == other.opening_loc.nil?) &&
(closing_loc.nil? == other.closing_loc.nil?) &&
(parameters === other.parameters) &&
(body === other.body)
end
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11705
def accept(visitor)
visitor.visit_lambda_node(self)
end
def accept: (Visitor visitor) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11710
def child_nodes
[parameters, body]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11781
def closing
closing_loc.slice
end
def closing: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11758
def closing_loc
location = @closing_loc
return location if location.is_a?(Location)
@closing_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader closing_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11723
def comment_targets
[operator_loc, opening_loc, closing_loc, *parameters, *body] #: Array[Prism::node | Location]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11715
def compact_child_nodes
compact = [] #: Array[Prism::node]
compact << parameters if parameters
compact << body if body
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11728
def copy(locals: self.locals, operator_loc: self.operator_loc, opening_loc: self.opening_loc, closing_loc: self.closing_loc, parameters: self.parameters, body: self.body, location: self.location)
LambdaNode.new(source, locals, operator_loc, opening_loc, closing_loc, parameters, body, location)
end
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11736
def deconstruct_keys(keys)
{ locals: locals, operator_loc: operator_loc, opening_loc: opening_loc, closing_loc: closing_loc, parameters: parameters, body: body, location: location }
end
def deconstruct_keys: (Array keys) -> { locals: Array, operator_loc: Location, opening_loc: Location, closing_loc: Location, parameters: Prism::node?, body: Prism::node?, location: Location }
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11786
def inspect
InspectVisitor.compose(self)
end
def inspect -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11776
def opening
opening_loc.slice
end
def opening: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11751
def opening_loc
location = @opening_loc
return location if location.is_a?(Location)
@opening_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader opening_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11771
def operator
operator_loc.slice
end
def operator: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11744
def operator_loc
location = @operator_loc
return location if location.is_a?(Location)
@operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader operator_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 11804
def type
:lambda_node
end
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