perl 数组和哈希切片

切片用法可在数组和哈希中提取值

数组中取数组

my @array = qw(aa bb cc dd);my @select = @array[1,3];print "@select\n";##输出bb dd
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哈希中取值

my %hash = (    "a" => 1,    "b" => 2,    "c" => 3,    "d" => 4,);my @select = @hash{qw(a c)}; ## 提取key为‘a’‘c’对应的值print "@select\n";##输出为1 3
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哈希中取哈希

my %hash = (    "a" => 1,    "b" => 2,    "c" => 3,    "d" => 4,);my %select = %hash{qw(a c)}; ##提取key为‘a’‘c’的hashmap {print "$_=> $select{$_}\n"} keys %select;##输出为：a=> 1c=> 3