This comes from a standard utility library I wrote for myself years ago. uniqStrings will work faster, but if your data contains references they will be broken. uniqValues will work even if your list contains references.

#_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
#   Function:  uniqStrings()
#   Author:  Dave Mueller
#   Returns:     @uniq 
#   Parameters:  @array
#   Description: Returns a unique list of all Strings found in @array
#                Note: references wil be broken . . .
#_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
sub uniqStrings
{
    my %temp = ();
    @temp{@_} = ();
    return keys %temp;
}

#_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
#   Function:  uniqValues()
#   Author:  Dave Mueller
#   Returns:     @uniq 
#   Parameters:  @array
#   Description: Returns a unique list of all values found in @array  
#_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
sub uniqValues
{
    my %temp = ();
    @temp{@_} = (1 .. scalar(@_));
    return map({$_[$_]} values %temp);
}

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A truely compassionate attitude towards other does not change, even if they behave negatively or hurt you

—His Holiness, The Dalai Lama

In reply to Re: better union of sets algorithm? by JediWizard
in thread better union of sets algorithm? by perrin

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