Do I need a last `else` clause in an `if. . . else if` statement? 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
Is it necessary to write else part in every if condition? "One option is to code the else clause—with a null statement if necessary—to show that the else case has been considered Coding null elses just to show that that case has been considered might be overkill, but at the very least, take the else case into account
Else clause on Python while statement - Stack Overflow The else clause is only executed after the while condition is evaluated to be false Thus, if you break out of the loop, or if an exception is raised, the else won't be executed (since the while condition has not been evaluated to be false yet)
What is the correct syntax for else if? - Stack Overflow One reason very old languages use this distinct syntax instead of "else if" is that the "else if" introduces a grammar ambiguity Old parser generators were hard to teach about what to do for ambiguities, so we avoided them
sql - can you do an ELSE WHEN on a CASE - Stack Overflow 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: