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So that is it for generic types already.

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They can really be tricky to understand but in the end the summary I gave you in the last lecture is

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the perfect explanation.

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They give us flexibility combined with type safety we're flexible regarding the values we pass in or

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the values we use in our class at least as long as we adhere to the possible constraints which you might

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have added.

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But we got full pipe support for what we then do with the class or with the result of a generic function

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because typescript then knows which concrete type we pass in what we call the function here or when

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we instantiate the class here.

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Here we then set a concrete type but we don't lock does class or dysfunction down to that concrete type

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when we create it.

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Instead we're flexible and might just provide some constraints.

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But of course these constraints also are optional and you might have some generic classes or generic

14
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functions which have no constraints and some which have a lot of constraints.

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So generic types are a really useful feature with promise and array.

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I showed you two of the many built in generic types and of course we'll also see more including custom

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generic types brought this course.