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array_values
Posted on October 4th, 2009 No commentsThe array_values() function in PHP takes an array and returns all it’s values as a numeric array.
PHP
$array = array('go' => 'green', 'stop' => 'red'); var_dump( array_values($array) ); /* Array ( [0] => green [1] => red ) */
To replicate this functionality in Ruby, we need to use a Hash object, since arrays in Ruby don’t use associative key/value pairs.
Ruby
array = { :go => 'green', :stop => 'red' }; puts array.values; # => ["green", "red"]
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list
Posted on October 1st, 2009 No commentsThe list() function in PHP is used to assign multiple variables as if they were an array. Technically, list() is not a function in PHP, it is a language construct.
Ruby has no real need for a function such as list(), as the same can be achieve using parallel assignment - i.e. assigning comma separated variables to elements of an array using the normal assignment operator.
PHP
$langs = array('php', 'ruby', 'perl'); list($lang1, $lang2, $lang3) = $langs; echo $lang1; // php echo $lang2; // ruby echo $lang3; // perl
Ruby
langs = [ "php", "ruby", "perl" ]; lang1, lang2, lang3 = langs; puts lang1; # php puts lang2; # ruby puts lang3; # perl
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array_combine
Posted on July 23rd, 2009 3 commentsThe array_combine() function creates an associative array (hash) by using one array for keys and another for values.
PHP
$a = array('python', 'lisp', 'perl'); $b = array('PY', 'LI', 'PE'); $c = array_combine($a, $b); print_r($c); => /* Array ( [python] => PY [lisp] => LI [perl] => PE ) */
To replicate this functionality in Ruby, we need to use a Hash object, since arrays in Ruby don’t use associative key/value pairs.
Since there is no exact equivalent of to the array_combine() function in Ruby, we manually create a hash from two different arrays.
Ruby
p1 = ['python', 'lisp', 'perl']; p2 = ['PY', 'LI', 'PE']; # initialize the hash combined_hash = {} # build the hash from 2 different arrays p2.each_with_index do |val, key| combined_hash[p1[key]] = val end # print resulting hash p combined_hash => # ["python"=>"PY", "lisp"=>"LI", "perl"=>"PE"]
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array_key_exists
Posted on April 8th, 2009 No commentsReturns TRUE if the given argument is set in the array. The argument passed in can be any value possible for an array index.
PHP
$a = array('first' => 1, 'second' => 2); var_dump( array_key_exists('first', $a) ); // => true
Ruby
animals = {:sheep => 1, :cow => 2}; puts animals.include?(:cow); # => true
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array_change_key_case
Posted on March 28th, 2009 1 commentThis function changes all keys in an array by returning an array with all keys from argument lowercased or uppercased. Numbered indices are left as is.
PHP
$input_array = array('FirSt' => 1, 'SecOnd' => 4); print_r( array_change_key_case($input_array, CASE_UPPER) ); // => array('FIRST' => 1, 'SECOND' => 4);
To replicate this functionality in Ruby, we need to use a Hash object, since arrays in Ruby don’t use associative key/value pairs.
Ruby
hash = {'FirSt' => 1, 'SecOnd' => 4} result = hash.inject({}) do |hash, keys| hash[keys[0].upcase] = keys[1] hash end p result # => { 'FIRST' => 1, 'SECOND' => 4 }
PHP, Ruby arrays, hash, keys, lower case, upper case
