How do I append hash a to hash b in Perl without using a loop?
如何在不使用循环的情况下将散列a附加到Perl中的散列b?
4 个解决方案
#1
31
If you mean take the union of their data, just do:
如果你的意思是采用他们的数据联合,只需:
%c = (%a, %b);
#2
23
You can also use slices to merge one hash into another:
您还可以使用切片将一个哈希合并到另一个哈希:
@a{keys %b} = values %b;
Note that items in %b will overwrite items in %a that have the same key.
请注意,%b中的项目将覆盖%a中具有相同键的项目。
#3
2
This will merge hashes and also take into account undefined entries, so they don't replace the content.
这将合并哈希并且还会考虑未定义的条目,因此它们不会替换内容。
my %hash = merge(\%hash1, \%hash2, \%hash3);
sub merge {
my %result;
%result = %{ $_[0] };
shift;
foreach my $ref (@_) {
for my $key ( keys %{$ref} ) {
if ( defined $ref->{$key} ) {
$result{$key} = $ref->{$key};
}
}
}
return %result;
}
#4
2
my %c = %a;
map {$c{$_} = $b{$_}} keys %b;
#1
31
If you mean take the union of their data, just do:
如果你的意思是采用他们的数据联合,只需:
%c = (%a, %b);
#2
23
You can also use slices to merge one hash into another:
您还可以使用切片将一个哈希合并到另一个哈希:
@a{keys %b} = values %b;
Note that items in %b will overwrite items in %a that have the same key.
请注意,%b中的项目将覆盖%a中具有相同键的项目。
#3
2
This will merge hashes and also take into account undefined entries, so they don't replace the content.
这将合并哈希并且还会考虑未定义的条目,因此它们不会替换内容。
my %hash = merge(\%hash1, \%hash2, \%hash3);
sub merge {
my %result;
%result = %{ $_[0] };
shift;
foreach my $ref (@_) {
for my $key ( keys %{$ref} ) {
if ( defined $ref->{$key} ) {
$result{$key} = $ref->{$key};
}
}
}
return %result;
}
#4
2
my %c = %a;
map {$c{$_} = $b{$_}} keys %b;