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 ran 100 million Ternary Operators and 100 million If-Else statements and recorded the performance of each. Here is the code: Stopwatch s = new Stopwatch(); // System.Diagnostics Stopwatch int test = 0; s.Start(); for(int a = 0; a < 100000000; a++) test = a % 50 == 0 ? 1 : 2; s.Stop(); s.Restart(); … Read more
You need to read section 15.25 of the Java Language Specification. In particular: Otherwise, if the second and third operands have types that are convertible (ยง5.1.8) to numeric types, then there are several cases: If one of the operands is of type byte or Byte and the other is of type short or Short, then … Read more
In any sane language, the ternary operator is right-associative, such that you would expect your code to be interpreted like this: $a = 2; echo ($a == 1 ? ‘one’ : ($a == 2 ? ‘two’ : ($a == 3 ? ‘three’ : ($a == 4 ? ‘four’ : ‘other’)))); # prints ‘two’ However, the … Read more
Others have already suggested the right way of doing it but if you really want to use ternary operator you need to use parenthesis as: $province = 7; $Myprovince = ( ($province == 6) ? “city-1” : (($province == 7) ? “city-2” : (($province == 8) ? “city-3” : (($province == 30) ? “city-4” : … Read more
This is a GNU C extension (see ?: wikipedia entry), so for portability you should explicitly state the second operand. In the ‘true’ case, it is returning the result of the conditional. The following statements are almost equivalent: a = x ?: y; a = x ? x : y; The only difference is in … Read more
MatLab doesn’t have a ternary operator, or any other syntactic sugar for one-line if-statements. But if your if-statement is really simple, you could just write it in one line anyway: if (cond); casetrue(); else; casefalse(); end It’s not as simple as ternary operator, but still better than writing it in 5 lines of code.
PHP 7 adds the null coalescing operator: // Fetches the value of $_GET[‘user’] and returns ‘nobody’ // if it does not exist. $username = $_GET[‘user’] ?? ‘nobody’; // This is equivalent to: $username = isset($_GET[‘user’]) ? $_GET[‘user’] : ‘nobody’; You could also look at short way of writing PHP’s ternary operator ?: (PHP >=5.3 only) … Read more
Quoting from C++ standard draft N4296, Section 5.16 Conditional operator, Paragraph 6.3: One or both of the second and third operands have pointer type; pointer conversions (4.10) and qualification conversions (4.4) are performed to bring them to their composite pointer type (Clause 5). The result is of the composite pointer type. Section 5 Expressions, Paragraph … Read more
To my personal taste, a carefully aligned nested ternary beats the if-else mess: const H = C == 0 ? null : V == r ? (g – b) / C : V == g ? (b – r) / C + 2 : (r – g) / C + 4 ;