New keyword: empty

[TheTrigger]

We already reached is null and is not null

Now what about is [not] empty for enumerables?

null is empty => true
"" is empty => true

I guess null == empty goes against some null conventions...

However, I don't like parentheses, they distract me, and I feel the empty word very uncomfortable to type... but...

"free us from string.IsNullOrEmpty and items.Any()" 😁

[333fred]

See #3435.

[alrz]

string.IsNullOrEmpty is s is null or "" or s is null or { Length: 0 }

With length patterns it would be s is null or [0] or e is [>0] instead of e.Any()

Length patterns were initially discussed in https://github.com/dotnet/csharplang/blob/master/meetings/2020/LDM-2020-12-16.md

[TonyValenti]

For enumerables I use an IsEmpty extension method(!Any) and for strings I use a IsBlank(string.IsNullOrEmpty) extension method to shortcut all that unnecessary typing.

[huoyaoyuan]

New keyword is very likely to be rejected.

[huoyaoyuan]

Generally, I think keyword can be introduced as a necessary part of a big set of feature. It shouldn't be introduced for a minor feature.