Would prefer Groovy's Elvis operator "?:" instead of "??"

[HendrikJan]

a ?: b

looks more descriptive to me than

a ?? b

to me, because it contains both characters of the more verbose syntax

a ? a : b;

[seaneagan]

The more verbose syntax is actually a == null ? b : a or equivalently a != null ? a : b. Personally I don't see an obvious expansion of a ?: b to either of those.

One other syntax to consider would be a else b. But ?? is more similar to ?..

[munificent]

If you look around, this same operator is spelled either ?? or ?: in a bunch of different languages. I don't think either one has a big majority. C# and Swift use ??, PHP and Groovy use ?:.

Personally, I prefer ??, in particular because it ties in nicely with Sean's suggestion about compound assignment in #6.