Hash::NoVivify Hash::NoVivify is a Perl extension for non-vivifying exists and defined functions.
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Perl module non-vivifying exists defined functions non-vivifying exists

Hash::NoVivify Description

Hash::NoVivify is a Perl extension for non-vivifying exists and defined functions. Hash::NoVivify is a Perl extension for non-vivifying exists and defined functions.SYNOPSIS use Hash::NoVivify qw(Defined Exists); ... if (Exists(%hash, qw(key1 key2 ... keyn ))) { ... } if (Defined(%hash, qw(key1 key2 ... keyn))) { ... }When used on a hash, the exists() and defined() functions will create entries in a hash in order to evaluate the function.For instance, the code: %a = (a => 1, b=> 2); print "Doesn't existn" unless exists($a{c}); print "Also Doesn't existn" unless exists($a{c}->{d}); print "Oh, my, not goodn" if exists($a{c});will print out: Doesn't exist Also Doesn't exist Oh, my, not goodThe Hash::NoVivify module provides two functions, Defined() and Exists(), which avoid this, at the cost of a slightly convoluted syntax. Both functions take a reference to a hash, followed by a list of descending keys defining the hash entry to be investigated. Requirements: · Perl

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