MaxByOrDefault

[GoogleCodeExporter]

Currently, MaxBy will throw an exception if executed on an empty enumerable.  I 
would like a way to provide it with a default value to use, or have it use 
default(TSource).

Example usage:
var emptyEnumerable = Enumerable.Empty<Person>();
var result = emptyEnumerable.MaxByOrDefault(person => person.Age);
Assert.Equal(0, result);

result = emptyEnumerable.MaxBy(person => person.Age, 10);
Assert.Equal(10, result);

Original issue reported on code.google.com by mi...@zoltu.net on 8 Dec 2014 at 8:12

[GoogleCodeExporter]

I also think that Max, Min, MaxBy and MinBy would benefit from having 
...IsDefault methods.

I think though that if returning a value type, the return type should be a 
nullable if possible.

Original comment by rmy...@gmail.com on 25 Jul 2015 at 12:36

[GoogleCodeExporter]

If you want null out for a value type then you can achieve this by

emptyEnemurable.MaxByOrDefault<Nullable<UInt32>>(person => person.Age);
Assert.Equal(null, result);

or

emptyEnumerable.MaxBy<Nullable<UInt32>>(person => person.Age, null);
Assert.Equal(null, result);

Original comment by mi...@zoltu.net on 25 Jul 2015 at 5:19

[GoogleCodeExporter]

This issue has been migrated to:
https://github.com/MoreLINQ/morelinq/issues/96
The conversation continues there.
DO NOT post any further comments to the issue tracker on Google Code as it is 
shutting down.
You can also just subscribe to the issue on GitHub to receive notifications of 
any further development.

Original comment by azizatif on 21 Aug 2015 at 6:56