1

Do the . member access and () function call syntactical elements have defined precedence and associativity that's written down in a doc somewhere? They are not in the official list of operators linked from the language reference. (Whereas the assignment operator is.)

2

These are not operators but rather part of the language grammar. There’s a lot of complexity here but a good place to start would be the explicit-member-expression and function-call-argument-clause productions in The Swift Programming Language > Summary of the Grammar.

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Quinn “The Eskimo!” @ DTS @ Apple

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3

Yup, understood they're not formally operators. I guess I can parse (ahem) the information I need out of the grammar. Thank you for the pointer!

4

FWIW, I'm pretty sure they both binds tighter than all operators (including prefix & postfix). So this:

var a = [1, 2, 3]
a . randomElement()!

would look like this:

((a.randomElement())!)
5

Thanks. That is what I would expect (and believe I have observed) as well.