Array.filter
filterfilter 
Group: Selections
Documentation
Selects all elements of this array which satisfy a condition.
Arguments
- filter: The filter to apply to the array. It can either be an instance of- Filter_Conditionor a predicate taking a value and returning a boolean value indicating whether the corresponding element should be kept or not.
Examples
Selecting all elements that are greater than 3.
      [1, 2, 3, 4, 5].to_array.filter (> 3)
      [1, 2, 3, 4, 5].to_array.filter (..Greater than=3)