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FirstOrDefault In F#

Answer 1

+4 A:

Regarding LINQ-to-SQL, see

http://blogs.msdn.com/dsyme/archive/2009/10/23/a-quick-refresh-on-query-support-in-the-f-power-pack.aspx

Regarding FirstOrDefault, it's just an extension method in the System.Linq namespace:

let l = [1;2;3]
open System.Linq 
let r = l.FirstOrDefault()

Brian 2010-05-06 20:36:36

Answer 2

+5 A:

Note that a more idiomatic approach within F# would probably be to use something along the lines of Seq.tryFind rather than to use the LINQ operators, although it's not a drop in replacement since it returns an option value.

kvb 2010-05-06 20:53:16

I would also recomend using `Seq.tryFind` - in F#, you generally try to aviod using `null` values (because they are dangerous). Handling option values is easier as you can also use `Option.map` and other functions for working with them (though, this probably won't work in F# LINQ to SQL)

Tomas Petricek 2010-05-06 21:06:35

Yep, `Seq.tryFind (fun _ -> true)` works great.

Joel Mueller 2010-05-06 21:36:48

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FirstOrDefault In F#

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