Class: Reacto::Operations::Last

Inherits:
Object
  • Object
show all
Defined in:
lib/reacto/operations/last.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Last

Returns a new instance of Last.



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# File 'lib/reacto/operations/last.rb', line 6

def initialize
  @marker = {}
  @prev = @marker
end

Instance Method Details

#call(tracker) ⇒ Object 



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# File 'lib/reacto/operations/last.rb', line 11

def call(tracker)
  close = lambda do
    tracker.on_value(@prev) if @prev != @marker
    tracker.on_close
  end
  error = lambda do |e|
    tracker.on_value(@prev) if @prev != @marker
    tracker.on_error(e)
  end

  Subscriptions::OperationSubscription.new(
    tracker,
    value: -> (v) { @prev = v },
    error: error,
    close: close
  )
end