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What do the question mark (?) and colon (:) mean?
((OperationURL[1] == "GET") ? GetRequestSignature() : "") It appears in the following statement:
string requestUri = _apiURL + "?e=" + OperationURL[0] + ((OperationURL[1] == "GET") ? GetRequestSignature() : ""); 
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Unlike all other operators in Objective-C—which are either unary or binary operators—the conditional operator is a ternary operator; that is, it takes three operands. The two symbols used to denote this operator are the question mark ( ? ) and the colon ( : ).
The conditional or question mark operator, represented by a ? , is one of the most powerful features in JavaScript. The ? operator is used in conditional statements, and when paired with a : , can function as a compact alternative to if...else statements. But there is more to it than meets the eye.
“Question mark” or “conditional” operator in JavaScript is a ternary operator that has three operands. The expression consists of three operands: the condition, value if true and value if false. The evaluation of the condition should result in either true/false or a boolean value.
It's sometimes just called "the ternary operator", but it's not the only ternary operator, just the most common one.
This is the conditional operator expression.
(condition) ? [true path] : [false path]; For example
string value = someBooleanExpression ? "Alpha" : "Beta"; So if the boolean expression is true, value will hold "Alpha", otherwise, it holds "Beta".
For a common pitfall that people fall into, see this question in the C# tag wiki.
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