class Lens

Attributes

getter[R]
setter[R]

Public Class Methods

identity() click to toggle source
# File lib/ruby-optics/lens.rb, line 50
def self.identity
  @_identity ||= Lens.new(
    -> (obj) { obj },
    -> (new_val, _obj) { new_val }
  )
end
new(getter, setter) click to toggle source
# File lib/ruby-optics/lens.rb, line 11
def initialize(getter, setter)
  @getter = getter
  @setter = setter
end

Public Instance Methods

compose_lens(other_lense) click to toggle source
# File lib/ruby-optics/lens.rb, line 31
def compose_lens(other_lense)
  Lens.new(
    -> (obj) { other_lense.getter.(getter.(obj)) },
    -> (new_val, obj) {
      setter.(
        other_lense.setter.(
          new_val,
          getter.(obj)
        ),
        obj
      )
    }
  )
end
each_lens() click to toggle source
# File lib/ruby-optics/lens.rb, line 46
def each_lens
  Each.new(outer_focus = self)
end
get(obj) click to toggle source
# File lib/ruby-optics/lens.rb, line 16
def get(obj)
  getter.(obj)
end
modify(obj, &blk) click to toggle source
# File lib/ruby-optics/lens.rb, line 24
def modify(obj, &blk)
  setter.(
    blk.(getter.(obj)),
    obj
  )
end
set(new_val, obj) click to toggle source
# File lib/ruby-optics/lens.rb, line 20
def set(new_val, obj)
  setter.(new_val, obj)
end