Hash::NoVivify 0.01

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 "Doesnt existn" unless exists($a{c}); print "Also Doesnt existn" unless exists($a{c}->{d}); print "Oh, my, not goodn" if exists($a{c}); will print out: Doesnt exist Also Doesnt exist Oh, my, not good The 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:	No special requirements
Platforms:	Linux
Keyword:	Defined,  Exists,  Extension,  Hash,  Hashnovivify,  Libraries,  Novivify,  Perl,  Print,  Programming
Users rating:	0/10