introduce only ??= about proposal-logical-assignment

[jridgewell]

I’ve needed &&= inside for loops a few times. And with ||=, I’m not always trying to initialize some variable.

I don’t think adding an operator piecemeal is a better outcome than adding a complete set, even if some of the additions are used more rarely.

👍

[claudepache]

There is quite a lot of JS code out there containing subtle bugs caused by treating || as the default operator, and don't the same caveats apply to ||= as apply to using || as a default operator?

I think that learning and teaching the difference between || and ?? is a better strategy than attempting to force clueless coders to write bugfree code in spite of themselves. Or, taking a more pessimistic POV, I think that people not understanding the difference between ||= and ??= are likely to write buggy code anyway.

An important point is that we introduce ??= not later than ||=, so that people will have no good reason to use the latter when they mean the former.

[ljharb]

There’s just as much code properly using || to select a value based on truthiness - I’d use ||= quite often for those use cases.

I don’t think adding an operator piecemeal is a better outcome than adding a complete set, even if some of the additions are used more rarely.