如何在Perl中獲得一個引用數組的切片？

Question

我有一個參考數組$arr_ref。我想獲得一個只包含原始數組中的單元格i..j的數組的引用。

Answer 1

@slice = @{$arr_ref}[$i..$j]; 

Answer 2

my $r = [0..9];  
print $_, "\n" for @$r[3..5]; 

如果包含引用的變量比普通標量更復雜，則將其括在大括號中。這是必要的，因爲提領標查找之前發生：

my @refs = ([0..9], [100..109]); 
print $_, "\n" for @{ $refs[1] }[4..8]; 

Answer 3

@rainbow = ("red", "green", "blue", "yellow", "orange", "violet", "indigo"); 
$arr_ref = \@rainbow; 
$i = 1; 
$j = 3; 
@slice = @$arr_ref[$i..$j]; # @slice is now green blue yellow