Check if List values are consecutive

Question

List dansConList = new List();
dansConList[0] = 1;
dansConList[1] = 2;
dansConList[2] = 3;

List dansRandomList = new List

        

Answer 1

Here is the another one. It supports {1,2,3,4} and {4,3,2,1} both. It tests sequential number differences equals 1 or -1.

Function IsConsecutive(ints As IEnumerable(Of Integer)) As Boolean
    If ints.Count > 1 Then
        Return Enumerable.Range(0, ints.Count - 1).
            All(Function(r) ints(r) + 1 = ints(r + 1) OrElse ints(r) - 1 = ints(r + 1))
    End If

    Return False
End Function