class Reacto::Operations::SliceWhen

Public Class Methods

new(predicate) click to toggle source
# File lib/reacto/operations/slice_when.rb, line 7
def initialize(predicate)
  @predicate = predicate
end

Public Instance Methods

call(tracker) click to toggle source
# File lib/reacto/operations/slice_when.rb, line 11
def call(tracker)
  previous = NO_VALUE
  buffer = []

  behaviour = -> (val) do
    if previous != NO_VALUE && @predicate.call(previous, val)
      tracker.on_value(Trackable.enumerable(buffer))
      buffer = []
    end

    buffer << val
    previous = val
  end

  error = -> (e) do
    tracker.on_value(Trackable.enumerable(buffer)) unless buffer.empty?
    tracker.on_error(e)
  end

  close = -> () do
    tracker.on_value(Trackable.enumerable(buffer)) unless buffer.empty?
    tracker.on_close
  end

  Subscriptions::OperationSubscription.new(
    tracker, value: behaviour, error: error, close: close
  )
end