{{notice:
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.
{{code:php $list = array('a', 'cat', 'a', 1, 'cat'); $result = array_count_values($list); var_export($result); // => array('a' => 2, 'cat' => 2, 1 => 1) }}
{{code: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} }}
{{related:
array/count
array/array_unique
strings/count_chars
}}