How to subtract each item from next item?

Question

3.67/5 (2 votes)

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I have a list of integer

Dim IntList as list(of integer) = {5,7,8,10,15,24,26}

I want subtraction each item from next item,
(7-5),(8-7),(10-8),(15-10),(24-15),(26-24)

ResultList = {2,1,2,5,9,2}

What I have tried:

I have no idea.

Dim ResultList = IntList.Where(Function(x, i) New KeyValuePair(Of Byte, Integer)(x.Key, i)).ToList

Posted 20-Aug-18 4:11am

gacar

Updated 20-Aug-18 7:41am

v2

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2 solutions

Solution 1

Try this:

VB

Sub Main()

    Dim IntList As List(Of Integer) = New List(Of Integer)

    IntList.Add(5)
    IntList.Add(7)
    IntList.Add(8)
    IntList.Add(10)
    IntList.Add(15)
    IntList.Add(24)
    IntList.Add(26)
    '{5, 7, 8, 10, 15, 24, 26}


    Dim ResList As List(Of Integer) = New List(Of Integer)

    For i = 0 To IntList.Count - 2
        ResList.Add(IntList(i + 1) - IntList(i))
    Next
End Sub

Posted 20-Aug-18 4:38am

Leo Chapiro

Updated 20-Aug-18 4:39am

v2

Comments

gacar 20-Aug-18 11:44am

Thanks. But i want linq solution.

Leo Chapiro 20-Aug-18 11:56am

You wrote that you have had no idea, now you have an algorithm. It will not be difficult to change it to LINQ, there is even online tools for this purpose.

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gacar · Accepted Answer · 2018-08-20T07:42:00

I found solution here

Dim IntList As List(Of Integer) = {5, 7, 8, 10, 15, 24, 26}.ToList

Dim ResultList = (From x In IntList Let nextindex = IntList.IndexOf(x) + 1 Let nextelement = IntList.ElementAt(If(nextindex = IntList.Count, nextindex - 1, nextindex)) Select nextelement - x).ToList()

result.RemoveAt(IntList.Count - 1)

ResultList = {2,1,2,5,9,2}