Which way is better to handle JSON with Crystal

Transcript

1. Which way is better to handle JSON with Crystal @ariarijp
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3. Today’s Lightning talk
4. The idea from ੢೔฻ཬ.rb 1st anniversary https://nishinipporirb.doorkeeper.jp/events/25958
6. I talked about my first Crystal program
7. Parse JSON using Crystal
9. I compared Ruby and Crystal
11. Crystal is awesome. But I don’t like Java like type casting
12. Next morning
14. @asterite commented on my repository (Amazingly, @asterite read Japanese!) https://github.com/ariarijp/ninirb-1st-anniversary-lt-crystal/commit/2d0062c4a1dc4cabaeb6884591c1771d768c0ce8
15. As a result
16. The legacy way require "http/client" require "json" place = ARGV[0] url = "http://api.openweathermap.org/data/2.5/weather?q=#{place}" resp = HTTP::Client.get(url) weather = JSON.parse(resp.body) pp (((weather as Hash)["weather"] as Array)[0] as Hash)["main"] puts "-" * 80 pp weather
17. Crystal way require "http/client" require "json" class WeatherResponse json_mapping({ weather: Array(Weather), }) class Weather json_mapping({ id: Int32, main: String, description: String, icon: String, }) end end place = ARGV[0] url = "http://api.openweathermap.org/data/2.5/weather?q=#{place}" resp = HTTP::Client.get(url) puts "-" * 80 weather_resp = WeatherResponse.from_json(resp.body) pp weather_resp pp weather_resp.weather[0].main
18. Use JSON Mapping!
19. Crystal is Awesome!
20. end