Pattern: Use of map { … }.compact instead of filter_map
Issue: -
In Ruby 2.7, Enumerable#filter_map has been added.
This rule identifies places where map { … }.compact can be replaced by filter_map. It is marked as unsafe auto-correction by default because map { … }.compact that is not compatible with filter_map.
# bad
ary.map(&:foo).compact
ary.collect(&:foo).compact
# good
ary.filter_map(&:foo)
ary.map(&:foo).compact!
ary.compact.map(&:foo)