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Why my code refuse to compare the generated hashes


Why my code refuse to compare the generated hashes

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Why my code refuse to compare the generated hashes
Tag : c , By : user179938
Date : January 11 2021, 03:32 PM

should help you out The crypt function returns a pointer to a static data buffer. That means that each time you call crypt that static data changes, so hash points to a buffer that changes on each iteration. This is why it matches every time.
You need to make a copy of the string returned on the first call to crypt. Then you can compare that against subsequent calls.
string hash = strdup(crypt(argv[1], salt));

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How to compare two Hashes so to return true if both Hashes have same keys/values?


Tag : ruby-on-rails , By : hyperNURb
Date : March 29 2020, 07:55 AM
Hope that helps I am using Ruby on Rails 3.2.2 and Ruby 1.9.3. I would like to compare two Hashes (A and B) so to return true if a Hash (A) include all keys/values of the other Hash (B).
class Hash
  def >=(b)  
    eq = true
    b.each { |k, v| eq &= !(self.include? k) ? false : ( ( ((self[k]&&v).is_a? Hash) && !((v||self[k]).empty?) ) ? self[k]>=v : true)}

    return eq
  end

end
params = { "action"=>"...", "controller"=>"...", "key_param1"=>"value_param1", "key_param2"=>"value_param2", "key_param3"=>"value_param3" }
my_hash1 = { "key_param1"=>"value_param1", "key_param2"=>"value_param2" }
my_hash2 = { "key_param4"=>"value_param4", "key_param1"=>"value_param1" }
my_hash3 = {}

p params >= my_hash1 #true
p params >= my_hash2 #false
p params >= my_hash3 #true
b = {1 => {2 => {} }, 4 => {} }
a = {1 => {2 => {3 => {} }}, 4 => {}, 5 => "123" }

p a >= b #true
p b >= a #false

How do I compare two arrays filled with hashes and return the hashes that are not present in the second?


Tag : ruby , By : snk
Date : March 29 2020, 07:55 AM
wish helps you Array#- would work:
array_a = [{'key' => 'a'}, {'key' => 'b'}, {'key' => 'c'}, {'key' => 'd'}]
array_b = [{'key' => 'a'}, {'key' => 'b'}, {'key' => 'd'}]

array_a - array_b
#=> [{"key"=>"c"}]

How do I compare two hashes containing ~25000 hashes?


Tag : ruby , By : MikeW
Date : March 29 2020, 07:55 AM
this will help This will return all the keys that were changed (i.e. created, removed or updated):
(old_hash.keys | new_hash.keys).select { |k| old_hash[k] != new_hash[k] }
keys = (old_hash.keys | new_hash.keys)
new_keys = keys.select { |k| old_hash[k].nil? }
deleted_keys = keys.select { |k| new_hash[k].nil? }
modified_keys = keys.select { |k| old_hash[k] != new_hash[k] }
unchanged_keys = keys - (new_keys | deleted_keys | modified_keys)

How to compare 2 hashes and findout how many nested hashes have changed


Tag : ruby-on-rails , By : adrianmooreuk
Date : March 29 2020, 07:55 AM
wish of those help From comparing one hash to another I need to get the number of nested hashes that have changed , I think you can do hash1.to_a - hash2.to_a to obtain the differences

how to compare hashes of hashes perl


Tag : perl , By : oiyto
Date : March 29 2020, 07:55 AM
help you fix your problem You need to iterate one of them and check for the existence of each key. Here is a verbose implementation.
use strict;
use warnings;

my %foo = ( a => 1, b => 2, c => 3, x => 7 );
my %bar = ( x => 7, y => 8, z => 9 );

foreach my $key ( keys %bar ) {
    CORE::say $key if exists $foo{$key} && $bar{$key} eq $foo{$key};
}
use strict;
use warnings;
use Test::More;

my @test_cases = (
    {
        'name' => 'all keys match',
        'th'   => {
            surfacecharge => {
                87 => 'negatively charged',
            },
        },
        'cd' => {
            surfacecharge => {
                87 => 'negatively charged',
            },
        },
        'true positives'  => { surfacecharge => 1, }, # here 
        'false negatives' => { surfacecharge => 0, }, # but this one comes out undef
    },
    {
        'name' => 'key matches, value does not',
        'th'   => {
            surfacecharge => {
                87 => 'negatively charged',
            },
        },
        'cd' => {
            surfacecharge => {
                87 => 'positively charged',
            },
        },
        'true positives'  => { surfacecharge => 0, },
        'false negatives' => { surfacecharge => 1, },
    },
    {
        'name' => 'two matching keys',
        'th'   => {
            surfacecharge => {
                87 => 'negatively charged',
                88 => 'chronically tired',
            },
        },
        'cd' => {
            surfacecharge => {
                87 => 'negatively charged',
                88 => 'chronically tired',
            },
        },
        'true positives'  => { surfacecharge => 2, },
        'false negatives' => { surfacecharge => 0, },
    },
    {
        'name' => 'two/zero, one/one',
        'th'   => {
            surfacecharge => {
                87 => 'negatively charged',
                88 => 'chronically tired',
            },
            areasurcharge => {
                1 => 'stuff',
                2 => 'goo',
            },
        },
        'cd' => {
            surfacecharge => {
                87 => 'negatively charged',
                88 => 'chronically tired',
            },
            areasurcharge => {
                1 => 'stuff',
                0 => 'do not want',
            },
        },
        'true positives'  => { surfacecharge => 2, areasurcharge => 1, },
        'false negatives' => { surfacecharge => 0, areasurcharge => 1, },
    },
);

foreach my $test (@test_cases) {
    my ( $true_positives, $false_negatives ) = determine_accuracy( $test->{th}, $test->{cd} );
    is_deeply $true_positives,  $test->{'true positives'},  "$test->{name}: true positives";
    is_deeply $false_negatives, $test->{'false negatives'}, "$test->{name}: false negatives";
}
done_testing;

sub determine_accuracy {
    my ( $instancesTH, $instancesCD ) = @_;

    my $tp;
    my $fn;

    foreach my $file ( keys %{$instancesTH} ) {
        $tp->{$file} = 0;
        $fn->{$file} = 0;
        foreach my $pos ( keys %{ $instancesTH->{$file} } ) {
            if ( exists $instancesCD->{$file}->{$pos}
                && $instancesCD->{$file}->{$pos} eq $instancesTH->{$file}->{$pos} )
            {
                $tp->{$file}++;
            }
            else {
                $fn->{$file}++;
            }
        }
    }
    return $tp, $fn;
}
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