class Reacto::Operations::Diff
Constants
- DEFAULT_FN
Public Class Methods
new(fn = DEFAULT_FN, initial = NO_VALUE)
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# File lib/reacto/operations/diff.rb, line 9 def initialize(fn = DEFAULT_FN, initial = NO_VALUE) @fn = fn @initial = initial end
Public Instance Methods
call(tracker)
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# File lib/reacto/operations/diff.rb, line 14 def call(tracker) prev = @initial value = -> (v) do if prev == NO_VALUE prev = v return end current = @fn.call(prev, v) prev = v tracker.on_value(current) end Subscriptions::OperationSubscription.new(tracker, value: value) end