array_count_values

  • This function’s solution uses a Ruby Hash object since Ruby arrays don’t use associative key/value pairs. See Array for more details.

    We can count the occurrences of the values in an array in Ruby using the Array#inject method to build a hash of values.

    PHP

    $list = array('a', 'cat', 'a', 1, 'cat');
$result = array_count_values($list);
var_export($result);
// => array('a' => 2, 'cat' => 2, 1 => 1)

    Ruby

    list = ['a', 'cat', 'a', 1, 'cat']
result = list.inject({}) do |hash, key|
  hash.include?(key) ? hash[key] += 1 : hash[key] = 1
  hash
end
p result
# => {"cat"=>2, "a"=>2, 1=>1}

    see also

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