https://github.com/hackvan/cash-register
https://github.com/hackvan/cash-register
Last synced: about 1 year ago
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- Host: GitHub
- URL: https://github.com/hackvan/cash-register
- Owner: hackvan
- Created: 2018-07-07T01:44:30.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2018-07-07T01:44:45.000Z (almost 8 years ago)
- Last Synced: 2025-01-05T17:13:22.585Z (over 1 year ago)
- Language: Ruby
- Size: 2.93 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# Object Oriented Cash Register
## Objectives
1. Build a class with instance methods.
2. Call instance methods inside of other instance methods.
3. Use instance methods to track information pertinent to an instance of a class.
## Description
We're going to create an Object Oriented Cash Register that can:
* Add items of varying quantities and prices
* Calculate discounts
* Keep track of what's been added to it
* Void the last transaction
## Instructions
**This is a test-driven lab!** You will need to read the spec file and the test output very carefully to solve this one.
**Hint #1:** Keep in mind that to call an instance method *inside* another instance method, we use the `self` keyword to refer to the instance on which we are operating. For example:
```ruby
class Person
attr_accessor :age
def initialize(age)
@age = 0
end
def birthday
self.age += 1
end
end
```
Follow along with the specs in `spec/cash_register_spec.rb`. Reading along with what the tests are looking for can be really helpful!
Take it one step at a time!
**Hint #2:** The `apply_discount` requires some knowledge about working with an Integer versus a Float in Ruby. Note that `100.class` returns Integer while `100.0.class` returns Float. Ruby provides methods for changing an object of type Integer to a Float and vice versa.
**Hint #3:** The `void_last_transaction` method will remove the last transaction from the total. You'll need to make an additional attribute accessor and keep track of that last transaction amount somehow. In what method of the class are you working with an individual item?
View Object Oriented Cash Register on Learn.co and start learning to code for free.