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Comma Operator

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Comma Operator

Binary ``,'' is the comma operator. In a scalar context it evaluates its left argument, throws that value away, then evaluates its right argument and returns that value. This is just like C's comma operator.

In a list context, it's just the list argument separator, and inserts both its arguments into the list.

The => digraph is mostly just a synonym for the comma operator. It's useful for documenting arguments that come in pairs. As of release 5.001, it also forces any word to the left of it to be interpreted as a string.

Source: Perl operators and precedence
Copyright: Larry Wall, et al.

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