jpcs
asked on
sort an hash
Hi!
I have a hash structure like this
%data = (
1 => {
name => "Johnny",
age => "21",
},
2 => {
name => "Barney",
age => "35",
},
3 => {
name => "Mary",
age => "18",
},
4 => {
name => "Chris",
age => "21",
},
);
I want to sort it by all names and ages, but I can't do that.
Please note that there are some ages equal.
By the way, how can I delete the entire "2" SubHash?
Thanks
I have a hash structure like this
%data = (
1 => {
name => "Johnny",
age => "21",
},
2 => {
name => "Barney",
age => "35",
},
3 => {
name => "Mary",
age => "18",
},
4 => {
name => "Chris",
age => "21",
},
);
I want to sort it by all names and ages, but I can't do that.
Please note that there are some ages equal.
By the way, how can I delete the entire "2" SubHash?
Thanks
ozo
perldoc -q sort
delete $data{2};
you should probably implement this is as an array, they're really just hashes 'keyed' by integers (and more efficient)
@data=( { name => "Johnny", age => "21"}, etc. );
note that the indicies start at 0
to sort this data by name you could do
@data = sort {$a->{name} cmp $b->{name} } @data;
or by age
@data = sort {$a->{age} <=> $b->{age} } @data;
since hashes aren't stored in any specific order i don't think the same thing could be accomplished with one sort function on your "hash of hashes" as it can with this "array of hashes"
to remove a hash entry:
delete $data{2}
@data=( { name => "Johnny", age => "21"}, etc. );
note that the indicies start at 0
to sort this data by name you could do
@data = sort {$a->{name} cmp $b->{name} } @data;
or by age
@data = sort {$a->{age} <=> $b->{age} } @data;
since hashes aren't stored in any specific order i don't think the same thing could be accomplished with one sort function on your "hash of hashes" as it can with this "array of hashes"
to remove a hash entry:
delete $data{2}
sorry to repeate you helver, you answered while i was typing so i didn't see it
ASKER
Great!!!
Thanks you all, specially adam923. You solved my problem.
regards
Thanks you all, specially adam923. You solved my problem.
regards
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