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
The ternary operator is generally to be avoided, but this form can be quite readable: result = (foo == bar) ? result1 : (foo == baz) ? result2 : (foo == qux) ? result3 : (foo == quux) ? result4 : fail_result; This way, the condition and the result are kept together on the same … 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
As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go. In addition to the full blown var+if+else block of code, though, this spelling is also used often: index := val if val <= 0 { index = -val } and if you have a block of code … Read more
iReport (JasperReports) uses a Ternary operator. For example, consider the following logic: IF boolean condition THEN execute true code ELSE execute false code END IF Using a ternary operator, this becomes: boolean condition ? execute true code : execute false code When using a variable with the following expression: $F{column_value}.intValue() == 42 ? “Life, Universe, … Read more
Because what you’ve written is the same as: echo (true ? 1 : true) ? 2 : 3; and as you know 1 is evaluated to true. What you expect is: echo (true) ? 1 : (true ? 2 : 3); So always use braces to avoid such confusions. As was already written, ternary expressions … Read more
Ternary operators can’t have statements that don’t return values, void methods. You need statements that have return values. You need to rewrite it. void bark(boolean hamlet) { System.out.println( hamlet ? “To Bark.” : “Not to Bark” ); }
The problem is that demo1 is not a simple expression, it is a method. And methods can be overriden, so it is not actually one method, it is a method group. Consider the following example: public class Demo { protected bool branch; protected void demo1 (int) {} protected void demo1 () {} protected void demo2 … Read more
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