In JavaScript, what code executes at runtime and what code executes at parsetime?
With objects especially, I don't understand what parts of the object run before initialization, what runs at initialization and what runs sometime after.
EDIT: It seems that parsetime is the wrong word. I guess I should have formulated the question "In the 2-pass read, what gets read the first pass and what gets read the second pass?"
Answer
A javascript file is run in a 2-pass read. The first pass parses syntax and collects function definitions, and the second pass actually executes the code. This can be seen by noting that the following code works:
foo();
function foo() {
return 5;
}
but the following doesn't
foo(); // ReferenceError: foo is not defined
foo = function() {
return 5;
}
However, this isn't really useful to know, as there isn't any execution in the first pass. You can't make use of this feature to change your logic at all.