March 1 - Build an ATM Dispensing Method in Ruby
This guide walks through how to build out the common Ruby coding interview question: how to build out an ATM dispensing method.
Guide Tasks
- Read Tutorial
- Watch Guide Video
- Complete the Exercise
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Summary
Implement an ATM method that properly dispenses the correct denominations to a user.
Exercise Description
Build out a method that takes two arguments: the total amount of money requested and the denominations that can be returned. And return the count of how many bills of each denomination should be returned to a user.
Example Data Input
245, [20, 10, 5]
In this example, 245 is the total amount requested at the ATM, and the array represents 20, 10, and 5 dollar bills.
Expected Output
{20=>12, 10=>0, 5=>1}
This hash represents 12 $20 dollar bills and 1 $5 dollar bills.
Real World Usage
This exercise is a very popular Ruby coding interview question. This will test your knowledge of several mathematical methods along with how you can combine multiple functional programming concepts.