83 lines
1.9 KiB
GDScript3
83 lines
1.9 KiB
GDScript3
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static func extrema_by(
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source : Observable,
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key_mapper : Callable,
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comparer : Callable
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) -> Observable:
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var subscribe = func(
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observer : ObserverBase,
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scheduler : SchedulerBase = null
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) -> DisposableBase:
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var has_value = RefValue.Set(false)
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var last_key = RefValue.Null()
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var items = []
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var on_next = func(x):
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var key = RefValue.Null()
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if GDRx.try(func():
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key.v = key_mapper.call(x)
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) \
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.catch("Error", func(err):
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observer.on_error(err)
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) \
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.end_try_catch(): return
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var comparison = RefValue.Set(0)
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if not has_value.v:
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has_value.v = true
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last_key.v = key.v
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else:
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if GDRx.try(func():
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comparison.v = comparer.call(key.v, last_key.v)
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) \
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.catch("Error", func(err):
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observer.on_error(err)
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) \
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.end_try_catch(): return
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if comparison.v > 0:
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last_key.v = key.v
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items.clear()
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if comparison.v >= 0:
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items.append(x)
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var on_completed = func():
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observer.on_next(items)
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observer.on_completed()
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return source.subscribe(
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on_next, observer.on_error, on_completed,
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scheduler
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)
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return Observable.new(subscribe)
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static func min_by_(
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key_mapper : Callable,
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comparer = null
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) -> Callable:
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# """The `min_by` operator.
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#
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# Returns the elements in an observable sequence with the minimum key
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# value according to the specified comparer.
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#
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# Examples:
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# >>> var res = GDRx.op.min_by(func(x): return x.value)
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# >>> var res = GDRx.op.min_by(func(x): return x.value, func(x, y): return x - y)
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#
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# Args:
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# key_mapper: Key mapper function.
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# comparer: [Optional] Comparer used to compare key values.
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#
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# Returns:
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# An observable sequence containing a list of zero or more
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# elements that have a minimum key value.
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# """
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var cmp = comparer if comparer != null else GDRx.basic.default_sub_comparer
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var min_by = func(source : Observable) -> Observable:
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return extrema_by(source, key_mapper, func(x, y): return -cmp.call(x, y))
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return min_by
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