How to map and remove nil values in Ruby

Question

I have a map which either changes a value or sets it to nil. I then want to remove the nil entries from the list. The list doesn\'t need to be kept.

Thi

Answer 1

In your example:

items.map! { |x| process_x url } # [1, 2, 3, 4, 5] => [1, nil, 3, nil, nil]

it does not look like the values have changed other than being replaced with nil. If that is the case, then:

items.select{|x| process_x url}

will suffice.