#map invocation wtf

anonymous-gist.rb

open(url) { |channel| JSON.parse(channel.read) }.map do |channel_data|
  attrs = channel_data.values_at("id", "key", "name", "description",
                                 "asset_url", "created_at", "updated_at")
  Channel.new(*attrs).tap(&:pick_stream_url)
end
# => #<Enumerator: [{"json"=>"attrs"}, { "json"=> "attrs"},{"json"=>"attrs"}]:map>

open(url) { |channel| JSON.parse(channel.read) }.map { |channel_data|
  attrs = channel_data.values_at("id", "key", "name", "description",
                                 "asset_url", "created_at", "updated_at")
  Channel.new(*attrs).tap(&:pick_stream_url)
}
# => [#<Channel:0x007ff7b388ecc8>, #<Channel:0x007ff7b38e2508>, #<Channel:0x007ff7b2a38048>]