如何在不使用引用的情况下按F#顺序删除重复项 [英] How can I remove duplicates in an F# sequence without using references

问题描述

我有一个排序的序列，想遍历该序列并返回序列中的唯一条目.我可以使用以下函数来完成此操作，但是它使用引用变量，并且我认为这不是解决问题的正确方法.

I have a sorted sequence and want to go through it and return the unique entries in the sequence. I can do it using the following function, but it uses reference variables and I don't think it's the correct way of solving the problem.

    let takeFirstCell sectors = 
        let currentRNCId = ref -1
        let currentCellId = ref -1
        seq {
            for sector in sectors do
                if sector.RNCId <> !currentRNCId || sector.CellId <> !currentCellId then
                    currentRNCId := sector.RNCId
                    currentCellId := sector.CellId
                    yield sector
        }

我该如何以功能性方式做到这一点?

How can I do this in a functional way?

推荐答案

[1;1;1;2;2;2;3;3;3]
|> Seq.distinctBy id
|> printfn "%A"

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