Closest one

closest.ruby

require 'sinatra'
require 'json'
require 'net/http'
require 'haml'
require 'geocoder'

get '/' do

    b = JSON.parse(Net::HTTP.get(URI.parse("http://data.cityofchicago.org/api/views/nen3-vcxj/rows.json")))
    us = [41.864447,-87.644806]
    a = b["data"].min_by {|x| dist(x,us)}
    "#{a}"
end

get '/address/:location' do

    b = JSON.parse(Net::HTTP.get(URI.parse("http://data.cityofchicago.org/api/views/nen3-vcxj/rows.json")))

    location = params[:location]

    us = Geocoder.coordinates(location)
    a = b["data"].min_by {|x| dist(x,us)}
    "#{a[1]}"

end



def dist(entry,loc)
  entry.last[1..2].map(&:to_f).zip(loc).inject(0) {|s,(c1,c2)| s+(c1-c2)**2}
end