Initial discussion from Babel's Slack

From claudepache/es-optional-chaining:

Technically the semantics are enforced by introducing a special Reference, called Nil, which is propagated without further evaluation through left-hand side expressions (property accesses, method calls, etc.), and which dereferences to undefined (or to /dev/null in write context).

In this example what would be the ouput if b is null?

a?.b()

I expect this to throw but as far as I understand Nil will be propagated and b will not be called.

a?.b?.()

In the latter case we're using the optional chaining syntax so that the function call b() is conditional

What is the difference between the two examples?
What do you think about that?