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monorkin/bitcoin_price_fetcher_composition_example.rb

Created December 23, 2018 21:29
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bitcoin_price_fetcher_composition_example.rb
require 'net/http'
require 'uri'
require 'json'
fetch =
self.method(:URI) \
>> Net::HTTP.method(:get) \
>> JSON.method(:parse) \
>> -> response { response.dig('bpi', 'EUR', 'rate') || '0' } \
>> -> value { value.gsub(',', '') } \
>> self.method(:Float)
fetch.call('https://api.coindesk.com/v1/bpi/currentprice.json') # => 3530.6782
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