按价值简单哈希搜索 [英] Simple hash search by value
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问题描述
我有一个简单的哈希,并希望根据$ value条件返回$ key。也就是说,对于第14行,我需要什么代码才能返回$ key为黄色的$ key?
I have a simple hash, and would like to return the $key based on $value criteria. That is, for line 14, what code would I need to return the $key where the $value is "yellow"?
1 #!/usr/bin/perl
2
3 # This program creates a hash then
4 # prints out what is in the hash
5
6 %fruit = (
7 'apple' => ['red','green'],
8 'kiwi' => 'green',
9 'banana' => 'yellow',
10 );
11
12 print "The apple is @{$fruit{apple}}.\n";
13 print "The kiwi is $fruit{kiwi}.\n";
14 print "What is yellow? ";
推荐答案
grep $ c
my @all_matches = grep { $fruit{$_} eq 'yellow' } keys %fruit;
print("$_ ") foreach @matching_keys;
my ($any_match) = grep { $fruit{$_} eq 'yellow' } keys %fruit;
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