Looking through the C# 5 Language Specification section 7.14: Conditional Operator we can see the following: If x has type X and y has type Y then If an implicit conversion (§6.1) exists from X to Y, but not from Y to X, then Y is the type of the conditional expression. If an implicit … Read more
As per the C11 standard, chapter §5.1.1.2, concatenation of adjacent string literals: Adjacent string literal tokens are concatenated. happens in translation phase. On the other hand: printf(“Hi” (test ? “Bye” : “Goodbye”)); involves the conditional operator, which is evaluated at run-time. So, at compile time, during the translation phase, there are no adjacent string literals … Read more
Sure, you can do nested ternary operators but they are hard to read. var variable = (condition) ? (true block) : ((condition2) ? (true block2) : (else block2))
This is commonly referred to as the conditional operator, and when used like this: condition ? result_if_true : result_if_false … if the condition evaluates to true, the expression evaluates to result_if_true, otherwise it evaluates to result_if_false. It is syntactic sugar, and in this case, it can be replaced with int qempty() { if(f == r) … Read more
I would basically recommend using it only when the resulting statement is extremely short and represents a significant increase in conciseness over the if/else equivalent without sacrificing readability. Good example: int result = Check() ? 1 : 0; Bad example: int result = FirstCheck() ? 1 : SecondCheck() ? 1 : ThirdCheck() ? 1 : … Read more
Try this : select if(Id is null, 0, id) as Id;
Personally I find the best way to do this is still the good old if statement: var value = someArray.indexOf(3); if (value === -1) { value = 0; }
Use: h.className = h.className + (h.className ? ‘ error’ : ‘error’) You want the operator to work for h.className. Better be specific about it. Of course, no harm should come from h.className += ‘ error’, but that’s another matter. Also, note that + has precedence over the ternary operator: JavaScript Operator Precedence
As @Rakete said in their excellent answer, this is tricky. I’d like to add on to that a little. The ternary operator must have the form: logical-or-expression ? expression : assignment-expression So we have the following mappings: someValue : logical-or-expression ++x, ++y : expression ??? is assignment-expression –x, –y or only –x? In fact it … Read more
The difference is that the explicit type of the returnsNull() method affects the static typing of the expressions at compile time: E1: `true ? returnsNull() : false` – boolean (auto-unboxing 2nd operand to boolean) E2: `true ? null : false` – Boolean (autoboxing of 3rd operand to Boolean) See Java Language Specification, section 15.25 Conditional … Read more