Conditional Assignment

Conditional Assignment-89
The importance of this type-checking lies in the operator's most common use—in conditional assignment statements.In this usage it appears as an expression on the right side of an assignment statement, as follows: The ?If it does, and this is not the desired behaviour, then an if-then-else statement should be used.

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If the language supports expressions with side effects but does not specify short-circuit evaluation, then a further distinction exists about which expression evaluates first—if the language guarantees any specific order (bear in mind that the conditional also counts as an expression).

Furthermore, if no order is guaranteed, a distinction exists about whether the result is then classified as indeterminate (the value obtained from some order) or undefined (any value at all at the whim of the compiler in the face of side effects, or even a crash).

The Rationale for Ada 2012 When the value of an if_expression is itself of Boolean type, then the else part may be omitted, the value being True. Both ALGOL 68's choice clauses (if and the case clauses) provide the coder with a choice of either the "bold" syntax or the "brief" form.

except that if x is an expression, it is evaluated only once.

It is commonly referred to as the conditional operator, inline if (iif), or ternary if.

An expression Although many ternary operators are possible, the conditional operator is so common, and other ternary operators so rare, that the conditional operator is commonly referred to as the ternary operator.However, in this idiom it is almost certain that the entire tuple expression will evaluate prior to the subscript expression, so there will be no short-circuit semantics.Nested ternaries can be simulated as returns the index of the first true value in the condition vector.On the basis of the evaluation of the Boolean condition, the entire expression returns value_if_true if condition is true, but value_if_false otherwise.Usually the two sub-expressions value_if_true and value_if_false must have the same type, which determines the type of the whole expression.One thing to remember with the IIF function, it will resolve all portions of the function.So even if the test returns true it will try to process the false and the true, but only return the true.(The given examples assume that the ternary operator has low operator precedence, which is true in all C-family languages, and many others.) The ternary operator can also be viewed as a binary map operation.In R—and other languages with literal expression tuples—one can simulate the ternary operator with something like the R expression (this idiom is slightly more natural in languages with 0-origin subscripts).If the language provides a mechanism of futures or promises, then short-circuit evaluation can sometimes also be simulated in the context of a binary map operation.The condition is evaluated true or false as a Boolean expression.


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