Perl Assignment Operators

Perl Assignment Operators-45
In this usage it appears as an expression on the right side of an assignment statement, as follows: The ?: operator is similar to the way conditional expressions (if-then-else constructs) work in functional programming languages, like Scheme, ML, and Haskell, since if-then-else forms an expression instead of a statement in those languages.

In this usage it appears as an expression on the right side of an assignment statement, as follows: The ?: operator is similar to the way conditional expressions (if-then-else constructs) work in functional programming languages, like Scheme, ML, and Haskell, since if-then-else forms an expression instead of a statement in those languages.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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Nested ternaries can be simulated as returns the index of the first true value in the condition vector.

Note that both of these map equivalents are binary operators, revealing that the ternary operator is ternary in syntax, rather than semantics.

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

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

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.

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.

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.

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