What syntax were we emulating with this code?

What syntax are we emulating with this code?

What is the result of executing this code?

For which of the given data types is the correct definition: "value

was not assigned"?  

Self-Executing Anonymous Function is not the same as Immediately Invoked Function Expression

Spread syntax "expands" an array into its elements, while rest

syntax collects multiple elements and "condenses" them into a single

element.

Which of the following is true about Symbol?