Perl Assignment Operators

Note that neither the true nor false portions can be omitted from the conditional operator without an error report upon parsing.

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The difference is significant if evaluating the expression has side effects.The condition is evaluated true or false as a Boolean expression.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.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.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.The importance of this type-checking lies in the operator's most common use—in conditional assignment statements.Programmers should consult their programming language specifications or test the ternary operator to determine whether or not the language will evaluate both expressions in this way.If it does, and this is not the desired behaviour, then an if-then-else statement should be used.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.


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