Question

In Python I can do something like this, which I think is more clear, than two pairs of conditionals in one statement:

if 1 < 2 < 3:
  print 'triple testing?'

else:
  print 'more like triple failing!'

without running into any issues, but in C#, it converts the first comparison, 1 < 2 into a bool before moving on, so it’s throwing an exception Operator '<' cannot be applied to operands of type 'bool' and 'int'.

Is there a way to avoid adding the second condition, so I don’t have to split up the triple condition into two sets of pairs, rather than one ‘triple’ condition, as I can do in Python?

if (1 < 2 & 2 < 3) { ... }

edit: An example where I’d use this is to make sure an int is between a range of numbers.

if ((0 < x) && (x < 10) { ... } //I can already do this
vs
if (0 < x < 10) { ... } //Would rather have something like this

Answer 1

There is no way of doing 1 < 2 < 3 in C#. However, you could write a quick extension method to mimic it:

public static class Test
{
    public static bool IsSorted<T>(this IEnumerable<T> e)
    {
        return e.Zip(e.Skip(1), (a, b) => Comparer<T>.Default.Compare(a, b))
            .All(x => x <= 0);
    }
}

...

if (new[] { 1, 2, 3 }.IsSorted())
{
    // Do something
}

If is definitely overkill for 3 numbers but may be useful if there are more values to compare or they are not hard coded.