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f#parent-childsequenceseq

Need to perform seq.Minby on property of a object sequence

So I have a Parent object that has a sequence of child objects. Each of these child objects contains a 'date' property. I want to find out which of these objects has the earliest 'date' property. This is the code I've tried, but it doesn't compile - giving me a parenthesis error

let Parent = new ParentClass()
let seq = Parent.ChildClass |> Seq.minBy(_.Date)

I'm certain this is either a typo or me misunderstanding how Seq.minby is too be used. Unfortunately I have only been able to find examples of simple sequences - none that use child properties.

Solution

  • You need to use a lambda expression for this

    let seq = Parent.ChildClass |> Seq.minBy(fun x -> x.Date)