Apr 13, 2017 · I am trying to discern the difference between: if else and else if How do you use these? And when do you use them and when not?

Explains how to use "*ngIf else" in Angular for conditional rendering of HTML elements.

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.

Jul 21, 2010 · 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).

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.

The else clause lets you write code that only makes sense if an exception wasn't thrown; the except clause can simply pass. If you put the logic in the try block, you risk silently hiding bugs in your code. Never squash exceptions you didn't expect.

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?

You can totally do that. It's just an ordering issue: [f(x) if x is not None else '' for x in xs] In general, [f(x) if condition else g(x) for x in sequence] And, for list comprehensions with if conditions only, [f(x) for x in sequence if condition] Note that this actually uses a different language construct, a conditional expression, which itself is not part of the comprehension syntax, while ...

But if the chain of the related If's occur inside of a function and each would execute a [return] statement, then the net effect of multiple if's matches using else if. However, it'd still be better practice to use [else if] whenever it doesn't make sense to test for the next condition, if the previous one was true.

I'm a newbie to Python and currently learning Control Flow commands like if, else, etc. The if statement is working all fine, but when I write else or elif commands, the interpreter gives me a sy...