Intermezzo–program based on experience–part 9

This post will be somewhat related to https://www.smart-jokes.org/programmer-evolution.html – but it makes total sense for me.

Let’s take what we achieved until now: We have 2 national banks –  and we gather exchange rates from there. What if we want to add more banks  -or let other programmers to add their dll’s to our software to just display the exchange rates from other banks ?

Let’s say now that the requirements are to to display the exchange rates for 2 national banks into a console program .  The manager says that later we may add other banks to load exchange rates . I will try to explain some differences how the code is created,depending on the experience.

Junior programmer: – all the code inside

int Main(){

// code for load and display the first bank exchange rates

// code for load and display the second bank exchange rates

}

Internship programmer: – create classes

//create  2 classes ( first bank,second bank ) and a Load method

int Main(){

var firstBank = new FirstBank();

var data = firstBank.Load();

DisplayData(data);

//same for second bank

}

Seasoned Programmer: – creates interfaces

//add to the 2 classes an interface,loading into a list,loading data for all the list,display

int Main(){

var l = new List<IExchangeRates[]>;
{
new GetFirstBank()),
new GetSecondBank()),

};

foreach(var rates in l){

var data= rates.Load();

DisplayData(data);

}

Until now,it is business as usual. But,from now on,there are many things that can be done,depending on programmer experience and will to do things ( until some error arrives and there is an official task for it) :

1. How to handle errors ( Polly ? )
2. How to load different libraries that contains our interface ( writing code that loads directly a list with all classes / DI / reflection / config files / plugin loader )
3. Think about performance ( loading data in parallel / caching )
4. Add Tests + code coverage
5. CI / CD

( if I do miss something,please put on comments)

What is my point here ? Is that I expect any programmer to go very fast to the level of Seasoned Programmer. But,after that,the knowledge of each programmer is relevant about how he does the points above ( or,if he does not …)