Re: Check if a key exists in several hashes at once

in reply to Check if a key exists in several hashes at once

You are having a problem with operator precedence. && is a higher precedence operator than not. For example, print not 0 && not 1 outputs 1 because you are really executing print not(0 && not(1)). You will get your expected result by either using the high-precedence ! or low-precedence and. See Operator Precedence and Associativity for more info.

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Re^2: Check if a key exists in several hashes at once by eyepopslikeamosquito (Archbishop) on Nov 13, 2010 at 01:36 UTC
Note that this common precedence booboo can be avoided by following the advice in Chapter 4, "Values and Expressions" of Perl Best Practices. See especially item 4.16: "Don't mix high- and low-precedence booleans".	[reply]

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