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Editorial Team
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Asked: 2026-05-25T06:35:12+00:00

I sometimes find myself thinking what word to use when referring an IEnumerable<Foo> .

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I sometimes find myself thinking what word to use when referring an IEnumerable<Foo>. I don’t think I see a consistent naming when reading.

IEnumerable<Foo>: It’s a type name. It isn’t helpful when thinking or using in a sentence.

Collection: It’s valid but not used everywhere. Although we have the System.Collections namespace.

Sequence: It’s valid too and probably defines it better.

Enumerator or Iterator: They emphasize the operation, rarely used.

What would be the most appropriate one? What do you read it in your code?

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1 Answer

  1. Editorial Team

    An IEnumerable<Foo> is not an iterator/enumerator – that is a separate concept for the device that iterates it.

    A collection generally refers to a specific device allowing operations such as add/remove; that does not apply here, but the term is not unreasonable.

    Personally I tend to use “sequence” in discussion, but I don’t use that for naming things in the code – I’d just use the thing the sequence represents, i.e. “orders”, “uniqueUsers”, etc – or in the case of generic methods, “items”, “values”, etc.

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