We have some customer records in a text file (customers.json) -- one customer per line, JSON-encoded. We want to invite any customer within 100km of our Dublin office for some food and drinks on us. Write a program that will read the full list of customers and output the names and user ids of matching customers (within 100km), sorted by User ID (ascending). You can use the first formula from this Wikipedia article to calculate distance. Don't forget, you'll need to convert degrees to radians. The GPS coordinates for our Dublin office are 53.339428, -6.257664.
ruby lib/main.rb
Output
****************************************************************************************************
Customers to invite
****************************************************************************************************
4 Ian Kehoe
5 Nora Dempsey
6 Theresa Enright
8 Eoin Ahearn
11 Richard Finnegan
12 Christina McArdle
13 Olive Ahearn
15 Michael Ahearn
17 Patricia Cahill
23 Eoin Gallagher
24 Rose Enright
26 Stephen McArdle
29 Oliver Ahearn
30 Nick Enright
31 Alan Behan
39 Lisa Ahearn
rspec
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