[Jarred]

alternatively:

  // Would run console.error with the Error object
  (alert(x) ?: console.error);

[azernik]

You may know this, but others may not: this is an actual thing, and is called the Elvis Operator (think the hair). https://en.wikipedia.org/wiki/Elvis_operator

Shockingly, this is actually accepted by GCC's C dialect! And PHP! By the simple implementation expedient of making the second operand of the ternary operator optional.

[lifthrasiir]

This is indeed a form supported by GNU C extension [1] (but `?:` is not a single token, so `? :` is permitted).

[1] https://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditi...