It works like this: (condition) ? true-clause : false-clause It’s most commonly used in assignment operations, although it has other uses as well. The ternary operator ? is a way of shortening an if-else clause, and is also called an immediate-if statement in other languages (IIf(condition,true-clause,false-clause) in VB, for example). For example: bool Three = … Read more
It is the ternary operator, and it works like in C (the parenthesis are not required). It’s an expression that works like: if_this_is_a_true_value ? then_the_result_is_this : else_it_is_this However, in Ruby, if is also an expression so: if a then b else c end === a ? b : c, except for precedence issues. Both are … Read more
This is a fairly frequently asked question. In C#, we almost always reason from inside to outside. When you see x = y; we work out what is the type of x, what is the type of y, and whether the type of y is assignment compatible with x. But we do not use the … Read more
When your first argument is null, they’re basically the same except that the null coalescing won’t output an E_NOTICE when you have an undefined variable. The PHP 7.0 migration docs has this to say: The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary … Read more
The (condition) ? /* value to return if condition is true */ : /* value to return if condition is false */ ; syntax is not a “shorthand if” operator (the ? is called the conditional operator) because you cannot execute code in the same manner as if you did: if (condition) { /* condition … 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
This is the conditional operator. $x ? $y : $z means “if $x is true, then use $y; otherwise use $z“. It also has a short form. $x ?: $z means “if $x is true, then use $x; otherwise use $z“. People will tell you that ?: is “the ternary operator”. This is wrong. ?: … Read more
This is the C ternary operator (Objective-C is a superset of C): label.frame = (inPseudoEditMode) ? kLabelIndentedRect : kLabelRect; is semantically equivalent to if(inPseudoEditMode) { label.frame = kLabelIndentedRect; } else { label.frame = kLabelRect; } The ternary with no first element (e.g. variable ?: anotherVariable) means the same as (valOrVar != 0) ? valOrVar : … Read more
The compiler first tries to evaluate the right-hand expression: GetBoolValue() ? 10 : null The 10 is an int literal (not int?) and null is, well, null. There’s no implicit conversion between those two hence the error message. If you change the right-hand expression to one of the following then it compiles because there is … Read more
It is called the Conditional Operator (which is a ternary operator). It has the form of: condition ? value-if-true : value-if-false Think of the ? as “then” and : as “else”. Your code is equivalent to if (max != 0) hsb.s = 255 * delta / max; else hsb.s = 0;