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Covariance and contravariance (computer science) - Wikipedia
Many programming language type systems support subtyping. For instance, if the type Cat is a subtype of Animal, then an expression of type Cat should be substitutable wherever an expression of type Animal is used. Variance is how subtyping between more complex types relates to subtyping between their components. For example, how should a list of Cats relate to a list of Animals? Or how should a fu
Why JavaScript Needs Types | Victor Savkin
Types have a bad reputation for making code harder to read, adding unnecessary ceremony, and in general complicating things. In this blog post I’d like to show that a type system done right can help make code more readable and toolable without constraining the expressiveness of the language. You can find the updated version of this blog post here: (http://victorsavkin.com/post/123555572351/writing
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GitHub - ericelliott/rtype: Intuitive structural type notation for JavaScript.
