From http://en.wikipedia.org/wiki/%3F%3A A GNU extension to C allows omitting the second operand, and using implicitly the first operand as the second also: a = x ? : y; The expression is equivalent to a = x ? x : y; except that if x is an expression, it is evaluated only once. The difference is … Read more
I prefer to think of it as “bitwise vs. conditional” rather than “logical vs conditional” since the general concept of “logical” applies in both cases. x & y // bitwise AND, 0101 & 0011 = 0001 x | y // bitwise OR, 0101 | 0011 = 0111 x && y // true if both x … Read more
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
The compiler does not infer the type of the result of the conditional operator from the usage of the result, but from the types of its arguments. The compiler fails when it sees this expression because it cannot deduce the type of the result: IsDateTimeHappy(myDateTime) ? null : myDateTime; Since null and DateTime are not … 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
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; }
Well, first of all, it’s much easier to chain than the standard ternary operator: string anybody = parm1 ?? localDefault ?? globalDefault; vs. string anyboby = (parm1 != null) ? parm1 : ((localDefault != null) ? localDefault : globalDefault); It also works well if a null-possible object isn’t a variable: string anybody = Parameters[“Name”] ?? … Read more
var startingNumber = startingNumber || 1; Something like that what you’re looking for, where it defaults if undefined? var foo = bar || 1; // 1 var bar = 2; foo = bar || 1; // 2 By the way, this works for a lot of scenarios, including objects: var foo = bar || {}; … Read more