Extension Methods from Joan Comas
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IsIn
Determines if an instance is contained in a sequence. Is the equivalent of Contains, but allows a more fluent reading "if item is in list", specially useful in LINQ extension methods like Where
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IsNotIn
Determines if an instance is not contained in a sequence. Is the equivalent of Contains == false, but allows a more fluent reading "if item is not in list", specially useful in LINQ extension methods like Where.