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
In C the ternary operator is defined like logical-OR-expression ? expression : conditional-expression where conditional expression is defined like logical-OR-expression The assignment operator has a lower priority than the OR operator. Thus you have to write a >= 5 ? b = 100 : ( b = 200 ); Otherwise the compiler consideres the expression … Read more
It is the conditional operator, and it is equivalent to something like this: if (pattern.Gotoccurance.score != null) { pattern.Gotoccurance.score; } else { ‘0’; } But I think that an assignment statement is missing in the code you posted, like this: var score = pattern.Gotoccurance.score !=null ? pattern.Gotoccurance.score : ‘0’; The score variable will be assigned … Read more
Minimized example: class A { }; class B : public A { }; class C : public A { }; int main() { B b; C c; A& refA = true? b : c; } Clang reports: main.cpp:13:19: error: incompatible operand types (‘B’ and ‘C’) A& refA = true? b : c; The relevant rule … Read more
Since you wanted the spec, here it is (from ยง15.25 Conditional Operator ? :, the last sentence of the section): The operand expression not chosen is not evaluated for that particular evaluation of the conditional expression.
Think of ternary operators like a method in this case. Saying a ? b : c is (for the intents and purposes you’re considering, see lasseespeholt’s comment) equivalent to calling the pseudocode method: ternary(a, b, c) if a return b else return c which is why people can say things like x = a ? … Read more
The operator precedence in the C/C++ language in not defined by a table or numbers, but by a grammar. Here is the grammar for conditional operator from C++0x draft chapter 5.16 Conditional operator [expr.cond]: conditional-expression: logical-or-expression logical-or-expression ? expression : assignment-expression The precedence table like this one is therefore correct when you use assignment on … Read more
Oracle doesn’t provide such IIF Function. Instead, try using one of the following alternatives: DECODE Function: SELECT DECODE(EMP_ID, 1, ‘True’, ‘False’) from Employee CASE Function: SELECT CASE WHEN EMP_ID = 1 THEN ‘True’ ELSE ‘False’ END from Employee
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; }
you can use && operator – second operand expression is executed only if first is true direction == “right” && slideOffset += $(“.range-slide”).width() in my opinion if(conditon) expression is more readable than condition && expression