Відео

I ran the following code in Python and it generated just the list: ["h","i"]. print("h i".split()). So it looks like on this matter that you are mistaken.

@@jakubication yes, you're right when f-on split() has no arguments, but when separator argument is specified empty strings are generated (which is not intuitive at all). print("h i".split(" ")) generates ["h", "", "i"]

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Lol, you're not wrong

Because a small d double is not an object and only objects can have methods.

@@sevret313 all types, including concrete types, are derived from an Object.

@@erosnemesis No, primitive types in Java are not derived from Object.

@@sevret313 true but you could always use Double or Integer instead

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You joke, but this video is a part of a larger strategy to make sure my shorts are evergreen. No matter how simple the concept is, people in a regular consistent pattern search "how to convert double to float in Java'', on UA-cam. As people are searching that topic, my video comes up and I get consistent views

@jakubication maybe people would search how to increment an integer by 1, You should make a short about it too

I just ran the code again, and it looks like you DO need the explicit cast. Omitting the explicit cast gives the possible lossy... error when you go to compile/run the code

@jakubication Thanks for the feedback. A search on Google tells me implicit cast in Java are only allowed if there is no information loss.

That one's easy, 4. /s

Yeah, you're right on that first part. That was simply a mistake I didn't catch in editing the video. As for you other suggestions, I would tend to agree. I'm pretty sure in making this video I had the implicit assumption that I could extend this code/video later for Blackjack. And that's how I made most of my design decisions. So: 1) Shuffling would be important within the deck class because unshuffled decks in blackjack would make an easy system to game, 2) There wouldn't be any concept of putting cards back in the deck, 3) Dealing would work fine because you would deal for the player and the dealer/house. Of course the calc_value logic would have to modified and the __str__ method would have to be fixed, but the rest would be easy to use in a game of blackjack.

I never actually knew that first part about constructor vs initializer. Thanks for the knowledge. I'm not certain on this, but I think because I called calc_value as a class method (using the name of the class, Card), that is why everything works as intended. Reasonable people can disagree on what to use/do for the suits. Finally, no disrespect, I see no world where ranks and suits would make sense as class variables. If you're having to "initialize" each card with __init__, shouldn't eàch card have instance variables? Or are you saying at the deck level it should have 52 class variables that each have a rank and suit? Ultimately I made the decisions I made in this video because I want to appeal to a beginner level audience. If I use time in the video to pontificate on constructor vs initializer, or introducing a new (to the viewer) kind of method like a static method, then I feel strongly like I'm disrespecting the viewer's intelligence and time. The aim of the video is just create a deck of cards in Python, so I try my best to avoid getting into the weeds.

@@jakubication You know it is an initializer, because it has "self" as parameter. So "self" should already been created, we are just giving values here. "that is why everything works as intended" I have tried, indeed it does work. But I would have added @staticmethod on top of the calc function and use "self" instead of Card. Because if you create an instance of the Card, - e.g. c = Card() - then calling c.calc_value() would throw an error. "I see no world where ranks and suits would make sense as class variables." I wrote "suits" not suits, because I meant the array you use to generate the deck and not a specific suit value. They could be class variables, so they can be queried from outside of the class as Deck.suits. Also "ranks" could be a dictionary, so that you can add a value to each, no need for a method to do that

That may very well work, but I was always taught to make sure my code was easy to read/made sense/was intuitive. Just because the array indicies of the rank's happen to correlate to the value of the card, doesn't mean I should use that. But I do understand what you're saying, thanks for the suggestion.

That works for several of the cards in this case, but 10, J, Q all have value 10 and K has value 0 for the expected use case here, so you still need to special case those. For me, I'd probably put the rank to value computation in game logic, outside of the deck logic, which would make the deck and card classes reusable for many different games.

Brogrammer, in Sublime

@@jakubication Thanks

You're welcome! Glad you liked it 👍

For you first point, I believe you're talking about the line, self.value = Card.calc_value(self.rank). That wouldn't create an infinite loop. It's written that way because, calc_value is a class method (belongs to the card class, not a particular card instance) so I couldn't call self.calc_value, so the only other option is to call Card.calc_value. And as for the shuffling method, I was always taught in college CS classes 3 main things, don't implement your own code to handle money (floating point imprecision), don't write your own cryptography code (someone smarter than you will surely crack it almost instantly), and don't write your own code to generate random values. (I don't remember the why for this one but presumably the answer is if this were apart of a serious gambling game at a casino, and you're randomness functionality was easily understood, then it's basically an easy money glitch). So that's my reason for that. Basically, if it's not the main part of the project I'm working on (the deck of cards and the cards themselves surely are the more important part then the cards being shuffled), then if someone has already written code for me to easily do a thing, then why reinvent the wheel. Hopefully that explains it. Thank you for the kind words at the end of your comment as well

> to import a method to shuffle a list is cheating ? random.shuffle() exists for exactly this reason. If you want to flex and write your own, you certainly can, and if it's fun, or if you're asked to for a programming interview, then sure. But for most use cases, the standard implementation is as good and better than one's own implementation. The OP gives 3 examples of when to not write your own implementation, but if the standard implementation works, then don't repeat the effort.

👍

You're welcome 👍

I understand what you're saying and agree. My purpose in making the video wasn't necessarily that the two are comparable, just fulfillment of keyword research. Apparently people consistently search "Python if vs try", so I made this where I explain if, then try in a concise manner.

Good video btw

Thanks 👍 I always appreciate a kind viewer

Yeah, you have to fudge the full reality a bit in a UA-cam short. pass definitely works as a placeholder that you can come back around later and fill in. But, strictly speaking, it doesn't evaluate to a value, and it doesn't change any state. Ultimately I would say it's up to the individual and how they would define "doing nothing" in code.

Um, assuming this isn't sarcasm, Python is the name of the programming language from which I'm teaching the concepts in the video. It has nothing to do with snakes.

@jakubication program like choir programs? And language like you can speak it to other people? This is blowing my mind rn

Program like a set of instructions to make a computer do something. Language like a certain well-defined type of instructions to make a computer do something. Here's the first paragraph from the Wikipedia article for further reading: "A programming language is a system of notation for writing computer programs.[1] Programming languages are described in terms of their syntax (form) and semantics (meaning), usually defined by a formal language. Languages usually provide features such as a type system, variables, and mechanisms for error handling. An implementation of a programming language is required in order to execute programs, namely an interpreter or a compiler. An interpreter directly executes the source code, while a compiler produces an executable program."

@@jakubication oh like Minecraft

Glad you liked it 👍

Lol 😂

That's JavaScript for ya

Although they look identical, because the two objects don't occupy the same memory address, JavaScript says they do not equal each other.

Correct 👍

That works. Ultimately it's a balancing act between readability and conciseness

Thanks for the pointer 👍

Very similar to this, but you cast the double to an int on the same line you assign it to an int. I can't link to videos in comments because this is a short, but if you search "How To Convert Double Int In Java Jakubication", I have a video on this that will show you the code for how to do it. Cheers!

@@jakubication Found the video! It was very helpful! Thank you very much for your hard work :D

Also that

Yes, but that wouldn't fit on the screen when trying to record the short. In real life code, though, it's just a matter of whether or not you prefer explicit (doing the cast) being better than implicit (what this code does).

You're welcome

no idea why this made me actually laugh out loud but it did

I always appreciate a viewer

@@jakubication please make more like this. want to write a function in c++? just write a function. this rules.

Genuinely didn't even know std::static_cast<> was a thing. Thanks for the pointer 👍

You're welcome

Correct 👍

You're welcome!

If you didn't already know, Java and JavaScript are very different languages. But, the concept of NaN (not a number) not being equal to anything applies across Java, JavaScript, and most other (if not all) languages

Thanks for the kind words. Yeah, I pinned a comment that pointed out my mistake

You're right, I got that wrong in the video