ternary-operator

This question already has an answer here: What does the question mark and the colon (?: ternary operator) mean in objective-c? 13 answers I heard about a kind of If statement which use ? and : in C I dont know how to use it and I cant find anything about it. I need to use it in order to shorten my code any help would be appreciated. ?: is ternary operator in C (also called conditional operator). You can shorten your code like if(condition) expr1; else expr2; to condition ? expr1 : expr2; See how it works: C11: 6.5.15 Conditional operator: The first operand is evaluated; there is a sequence

I'm pretty new to Ruby and Rails but even after searching stack overflow and google I couldn't find an answer to this. I've got a simple Ruby shorthand if statement that should return an integer like so: # in the context of this erb document `amount` is defined as 5. @c = ( defined? amount ? amount : r( 1,4 ) ) r() is a custom helper function that returns a random number between in this case 1 and 4. The way I intend this to work is that if amount is defined, then use the number defined as amount , else generate a random number between 1 and 4 and use that instead. When printing out @c however

The question is very simple, but I just could not find the answer! Why doesn't return x == 0? "" : "Hello" compile but return x == 0 ? "" : "Hello" does? This is really weird because all the other operators don't need an extra white space. e.g. let x = 1+1 let y = 1 + 1 are the same. I think it has something to do with optionals. But when you use a ? operator on a variable, it must be used like this: let s: String? = nil let x = s?.startIndex I mean it must follow another operator, right? I think it has something to do with optionals. It does. The documentation on operators says: There is one

I'm using a very simple ternary expression in my C# code: helperClass.SomeData = helperClass.HasData ? GetSomeData() : GetSomeOtherData(); In both cases, the functions on each path of the expression return a non-null object, but if I look at the result in the debugger, it is null until I reference it in the code such as using an assert: Debug.Assert(helperClass.SomeData != null); This only appears to happen if I use an "x64" or "Any CPU" platform setting in Debug mode. It's fine in "x86" mode. I try to be very cautious before assuming I've found a bug in the compiler or debugger, but I can't

I have seen advice that says the ternary operator must not be nested. I have tested the code below and it works okay. My question is, I haven't seen the ternary operator used like this before. So, is this as reliable as it were used in an if or could something like this come and bite me later(not in terms or readability, but by failing). $rule1 = true; $rule2 = false; $rule3 = true; $res = (($rule1 == true) && ($rule2 == false) && ($rule3 == true)) ? true : false; if($res) { echo "good"; } else { echo "fail"; } Thanks! If the results you are returning from the ternary operator are only "true"

I am tired of using code like: $blog = isset($_GET['blog']) ? $_GET['blog'] : 'default'; but I can't use: $blog = $_GET['blog'] || 'default'; Is there any way to do this without using isset() ? You have to wait for the next version of PHP to get the coalesce operator // Uses $_GET['user'] if it exists -- or 'nobody' if it doesn't $username = $_GET['user'] ?? 'nobody'; // Loads some data from the model and falls back on a default value $model = Model::get($id) ?? $default_model; Write a helper function. function arrayValue($array, $key, $default = null) { return isset($array[$key]) ? $array[