No true, because with such syntax else if is side-effect (i.e. it comes for free). In other words there is no else if syntax, there is only if and else here.
In your case, whether you need an else clause depends on whether you want specific code to run if and only if neither of condition1, condition2, and condition3 are true. else can be omitted for any if statement, there is nothing special in the last if of an if / else if chain. This is documented in any JavaScript grammar, e.g. in the specification.
No, ELSE is a catch-all. In your example, it's not clear why you would want to include a condition in the ELSE clause, since you've already checked the logically opposite condition in the first WHEN expression. However, more generally, you can nest CASE expressions, which would look something like this:
The else clause is executed if you exit a block normally, by hitting the loop condition or falling off the bottom of a try block. It is not executed if you break or return out of a block, or raise an exception. It works for not only while and for loops, but also try blocks. You typically find it in places where normally you would exit a loop early, and running off the end of the loop is an ...
Can you explain me why } must precede else or else if in the same line? Are there any other way of writing the if-else if-else statement in R, especially without brackets?
93 Python try-else What is the intended use of the optional else clause of the try statement? The intended use is to have a context for more code to run if there were no exceptions where it was expected to be handled. This context avoids accidentally handling errors you did not expect.
So any if-else control flow must be done in the expression evaluated above. Also since list comprehensions create a list, expression must be an expression that can be assigned to a variable.
Almost 10 years after this question has been asked and after programming with Python for 3 years, this is the first time I've seen the "for-else", "while-else" construct. I hope its low frequency use declines further into evaporation. The world is full of junior programmers that will "un-indent" the "else" to "fix" the bug they found.
