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Re: meaning of =()=

by ikegami (Pope)
on Jan 04, 2010 at 17:39 UTC ( #815613=note: print w/replies, xml ) Need Help??


in reply to meaning of =()=

=()= is not an operator.
$scalar =()= EXPR
is a funky way of writing
$scalar = ( () = EXPR )

It consists of two operations: a list assignment (() = EXPR) as the RHS of a scalar assignment ($scalar = ...). Both types of assignments are documented in perlop, but the bits that apply are:

  • The RHS of a list assignment is evaluated in list context.
  • The RHS of a scalar assignment is evaluated in scalar context.
  • A list assignment in scalar context returns the number of elements returned by its RHS.

In short, it's a means of evaluating an expression in list context and returning the number of elements returned instead of the elements themselves.

See Mini-Tutorial: Scalar vs List Assignment Operator

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