学习PERL语言

A: 如何找到2在 hash 表值当中呢?

#!/usr/bin/perl %x = ('a' => 1,'b' => 2,'c' => 3);

给出几种方法:

1.

my %reverse = reverse %x; if( defined( $reverse{2} ) ) { print "2 is a value in the hash!/n"; }

2.找出键盘key的值.

foreach my $key ( keys %x ) { print "2 is the value for $key/n" if $x{$key} == 2; }

3.使用 list类

use List::MoreUtils qw(any); if (any { $_ == 2 } values %x) { print "Found!/n"; }

4.Shorter answer using smart match:

use List::MoreUtils qw(any); if (any { $_ == 2 } values %x) { print "Found!/n"; }