F# - creating 100 objects into a List - most functional and idiomatic way

In F# what is the most functional开发者_StackOverflow and idiomatic way of creating or "newing up" 100 new objects into a List.

I guess for an example we could use DateTime as an example object.

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List.init 100 (fun x -> x * 2)

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Alternatively, as a list expression:

[for i in 1..100 -> new System.DateTime()]

But I think this is less idiomatic.

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I would consider using

[|for i in 1..100 -> new System.DateTime() |]

since you are working with mutable data.