Perl Assignment Operators

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).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.

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

The difference is significant if evaluating the expression has side effects.

In almost all languages, the ternary operator is right associative so that , which is rarely what any programmer expects.

(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.

is a ternary operator that is part of the syntax for basic conditional expressions in several programming languages.

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

The conditional operator's most common usage is to make a terse simple conditional assignment statement.

For example, if we wish to implement some C code to change a shop's normal opening hours from 9 o'clock to 12 o'clock on Sundays, we may use The two forms are nearly equivalent. : is an expression and if-then-else is a statement.

The 2012 edition of Ada has introduced conditional expressions (using if and case), as part of an enlarged set of expressions including quantified expressions and expression functions.

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.


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