Task: We have some customer records in a text file (customers.txt) -- one customer per line, JSON lines formatted. We want to invite any customer within 100km of venue 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).

• The GPS coordinates for the venue are 53.339428, -6.257664.

Solution:

This App loads user locations from a text file and displays the list of people in close vicinity.

For example finding all the people with a 100 km radius results in:

• Xcode 10.1*
• Swift 4.2

• Clone the project
• Navigate to the project directory
• Open DistanceCalculator.xcworkspace using Xcode
• Run the App either on a simulator or an actual device

Load Data	Show Guests

Problem Reading from file	No Guests Found

Guest List 1	Guest List 2