compact_blank in Rails
If you have an array or a hash, contains nil or empty element, and you want to
remove them, we could use compact method:
[1, nil, “3”, “”, []].compact
#=> [1, “3”, “”, []]
[1, nil, “3”, “”, []].reject { |e| e.nil? || e&.empty? }
#=> [1, “3”]
[1, nil, “3”, “”, []].reject(&:blank?)
#=> [1, “3”]
{1 => 2, 2 => nil, “3” => “4”, 4 => “”, 5 => []}.compact
#=> {1 => 2, “3” => “4”, 4 => “”, 5 => []}
{1 => 2, 2 => nil, “3” => “4”, 4 => “”, 5 => []}.reject { |_, v| v.nil? || v&.empty? }
#=> {1 => 2, “3” => “4”}
{1 => 2, 2 => nil, “3” => “4”, 4 => “”, 5 => []}.reject { |_, v| v.blank? }
#=> {1 => 2, “3” => “4”}From Raisl 6.1, we can use compact_blank
[1, nil, “3”, “”, []].compact_blank
#=> [1, “3”]
result = {1 => 2, 2 => nil, “3” => “4”, 4 => “”, 5 => []}.compact_blank
#=> {1 => 2, “3” => “4”}