Is it possible to use LINQ to check if all numbers in a list are increasing monotonically?

Question

I\'m interested if there is a way, in LINQ, to check if all numbers in a list are increasing monotonically?

Example

List l         


        

Answer 1

public static bool IsIncreasingMontonically(List list) 
    where T : IComparable
{
    return list.Zip(list.Skip(1), (a, b) => a.CompareTo(b) <= 0)
        .All(b => b);
}

Note that this iterates the sequence twice. For a List, that's not a problem at all, for an IEnumerable or IQueryable, that could be bad, so be careful before you just change List to IEnumerable.