Hey folks,
I’ve been programming OOP since I learned Java from the Sun Certified Java Programmer 6 book back in so long ago. Ever since I’ve learned a bunch of other languages, but regardless of which one it was (Go, JS, Rust, you name it), I always wrote it in an OOP-y style. Somehow that comes naturally to me, and when it’s not possible (like in functional languages, or Odin, for example), I’m kind of lost, because, well, no OOP.
Any suggestions for how to unlearn the thinking? Any resources to watch? I just started Handmade Hero (day 2 here I come), but not sure if that would help (and also I’ve never written a single line of C, so who knows how much sticks).
Thanks all!
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Good question!
You could watch this → https://www.youtube.com/watch?v=jyol7J1nlp8
And the Blow’s video then.
And this one could also be watched → https://www.youtube.com/watch?v=GKYCA3UsmrU
Instead of coupling the data with the code (in OOP) think about the data structure first. That means: make the structs, and then procedures to transform it.
entity_make :: proc (...params...) -> EntityStruct {
...stuff...
}
move_entity :: proc (what_entity, displacement) {
...
}
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I’ve recently seen this talk that I liked:
The Big 00Ps: Anatomy of a Thirty-five-year Mistake
The title is somewhat misleading as it mostly talks about what people were doing before OOP and what are the alternatives.
What I gathered is essentially that most solutions people come up with is thinking interms of systems instead of cramming everything into classes even when it doesn’t make sense. OOP is useful in specific instances where the problem can be naturally represented with classes (like simulating networking where C++ came from).
My explanation perhaps isn’t the best so you should really watch the video, Casey is really good explaining things clearly.
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Dude same, I was coming from js and Java and was trying to rewrite my game in Odin to test it out and I was like “where’s my classes!?” Come to find out it’s functional (sort of). I am now trying to train my brain to think differently. Thankfully Odin itself isn’t a hard language so I can guarantee you that it will come easy to you. Just learn what sets them apart and the language flow and you’re good.
I found this video:
An intro into what functional programming is.
I found it kinda helpful just to get the gist of what functional does and how it differs from the state hungry OOP. And I’m no pro at Odin by any means I just found myself really liking how different the flow is from most oop’s I’ve used.
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Come to find out it’s functional (sort of)
Not really, I mean not at all. Functional programming is related to treating functions as first-class primitives, and using function as the primary driver for computation. Rather than describing the program as a sequence of steps (imperative), functional programs are described as a function that can be composed of other functions. For example, something you might see in a functional language are functions like map, filter and reduce to work with arrays and transform them directly, as opposed to writing loop statements.
It’s also why it’s important to know about other paradigms and learn to think in different ways about how to write your programs. OOP will tell you that you have to bundle up your state and expose methods to manage that state, but you could have instead used a different approach, for example simply get from data A to data B, without any state management. There are situations where it is important to manage your state and perform correctness checks that the state didn’t become invalid, and there are other situations where all you need is a collection of algorithms that transform data into other data. So don’t try to unlearn the OOP, but use it alongside other paradigms.
One roadblock you may be hitting is trying to make your program more abstract than it needs to be. Thinking you might want to extend this, or have a system that’s capable of handling anything. You might start piling on interfaces, additional logic that handles situation that can’t happen, but might happen, because you might extend that. Odin makes writing interfaces harder on purpose. In reality you don’t need them that often.
For me encapsulation (bundling state and procedures together in a form of classes with methods) is one of the most powerful ideas in OOP that is unfortunately being discarded. In situations where you need to control state, I’d use this OOP-y approach, and in fact core library has its own fare share of encapsulation. String builder and parsers being the canonical state-manager structs. I suggest you look at them for how to adapt you OOP thinking into Odin. There are interfaces like io.Writer or mem.Allocator that can also show you how interfaces are done.
The road may suck, but remember to embrace the suck, and to keep it simple, stupid.
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Object-Oriented C →
https://www.codementor.io/@michaelsafyan/object-oriented-programming-in-c-du1081gw2
https://dmitryfrank.com/articles/oop_in_c
And a C book:
If you are adventurous, then the source code for Wolfenstein is a good read, and so is the source for Doom 
W informative information