This week's challenge was to create a program that mimicked the oystercard system. The program would allow you to top up the oyster card and touch in and out at stations.
Our program had to meet the following user story requirements:
In order to use public transport
As a customer
I want money on my card
In order to keep using public transport
As a customer
I want to add money to my card
In order to protect my money
As a customer
I don't want to put too much money on my card
In order to pay for my journey
As a customer
I need my fare deducted from my card
In order to get through the barriers
As a customer
I need to touch in and out
In order to pay for my journey
As a customer
I need to have the minimum amount for a single journey
In order to pay for my journey
As a customer
I need to pay for my journey when it's complete
In order to pay for my journey
As a customer
I need to know where I've travelled from
In order to know where I have been
As a customer
I want to see to all my previous trips
In order to know how far I have travelled
As a customer
I want to know what zone a station is in
In order to be charged correctly
As a customer
I need a penalty charge deducted if I fail to touch in or out
In order to be charged the correct amount
As a customer
I need to have the correct fare calculated
## What did I learn
One of the most valuable things I learnt this week was extracting classes and polymorphism. This has helped me develop my code, keep it clean and follow SRP principles.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent