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EnumerableOfTy... is a generic abstraction used in some programming language designs to describe a sequence of elements of a particular type that can be enumerated. The name suggests an enumerable collection parameterized by a type Ty. As an abstraction, it encapsulates iteration without committing to a specific container, such as an array, list, or stream.

In typical implementations, EnumerableOfTy... provides an iterator or GetEnumerator method that yields elements of type Ty. It supports common query and transformation operations—such as map, filter, and reduce—often with lazy evaluation to enable efficient composition. An instance can originate from a concrete collection or from a generator, and it can be converted to a concrete collection when needed.

Key features include type safety, debuggability, and the ability to compose operations into pipelines. It generally promotes separation between the interface that consumes data and the concrete sources that produce it, enabling APIs to accept any enumerable sequence rather than a specific collection type.

Use cases include processing data streams, building data transformation pipelines, and exposing flexible APIs that work with any enumerable sequence of Ty. It is commonly paired with language features or libraries that support higher-order functions and deferred execution.

Relation to other concepts: EnumerableOfTy... is analogous to constructs such as IEnumerable<T> in C#, Iterable in Java, and Sequence in Kotlin, serving a similar role of abstracting over any iterable source while preserving element type information.

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