The following breaks if names is nil. How can I have this map execute only if it's not nil?
self.topics = names.split(",").map do |n|
Topic.where(name: n.strip).first_or_create!
end
Perform map only when not nil?
Viewed 8880
6 Answers
Finally in ruby 2.7 you can use
['Moscow', 'Norilsk'].map do |city|
city if city == 'Norilsk'
end
=> [nil, "Norilsk"]
['Moscow', 'Norilsk'].filter_map do |city|
city if city == 'Norilsk'
end
=> ["Norilsk"]
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