Yay 😀

There may be a grammatical error in my last sentence

@@user-bq8xx1vj6u There isn't.

@@user-bq8xx1vj6u you're good, there is no error in your sentence

@@user-bq8xx1vj6u I guess in your case you would treat it like learning an actual language.

我也想创一门编程语言

Glad to hear it! Hope this series is good for you.

You are super sweet. Thanks. Hopefully you enjoy the high level series xD.

Yay. Yea I figured typescript would be a good choice for this series as I usually write parsers in C/C++ and it would take to long. But I think once you understand the recursive descent parser it all falls into place. If you have additional questions don’t hesitate to ask me on my discord and I’ll respond ASAP xD.

what ide do you use? i can't make typescript work in vscode

That’s awesome. If you have any questions feel to reach out on discord and I would love to chat or answer questions about interpreter/ vm stuff

Glad you liked it. After finals week im hoping to finish the series xD

Obviously this kind of interpreter is very slow but the sane principles apply. Hope it’s of use for you.

Please how do I configure deno to work on vscode

Hopefully you enjoy the series. There are some better ways I could have implemented some features through the series but I write the code following the C++ example I was originally planning lol. So there’s more typescript ways of doing things here

I think this is Xcode theme or Dracula

@@tylerlaceby Thank you!

Yepppers

Aww thanks

Please can how do a video of how to write a jsx transpiler?

You are welcome by the way😊

What part are you stuck with ? Also if you need some c++ help I would love to hop on a discord call and clear some things up hopefully. Also feel free to check out the repo on GitHub I have called emu

@@tylerlaceby Yo Discord to help hands on one on one guide? I have questions a ton of them.

I am using the runtime Deno through this series. It’s like node but supports typescript without a implicit build step.

Yep. This syntax has no more than 1 look ahead to parse. However if there were more and that was needed then indeed that would be a better choice

Haha well hopefully it’s helpful

@@tylerlaceby haha hopefully.. i always have stuck at parsing.. did you do pratt parsing in this walkthrough?

Glad you enjoy.

Great question. This is usually the job of the lever. As the lexer can check for characters like . And syntax for hex or binary literals. So floats or whatever are checked in the lexing state.

@@tylerlaceby Ah, cool! Thank you!

Yep I totally agree using regex here is your friend. But for a beginners series on language development I think it’s best to not use any regex as it’s more clear what’s happening. Cheers

@@tylerlaceby yeah that makes sense

But I mean this dosent have to be beginner friendly because you are are talking about a very major subject that I think people would need some background knowledge

@@spideyzac9355fair point. Yea I made some design decisions through the series that were a bit more cumbersome than needed. Hopefully it’s still good enough to teach this topic for beginners. Any other suggestions would also be appreciated as well.

@@spideyzac9355 I would only half agree. if a person is only mildly curious of the topic their not going to go learn a whole shit ton of stuff and then come back to the video that's suppose to explain how it's done, they'll probably just move on to the next video that doesn't have the prerequisite knowledge requirements. once you have a complete but not optimized piece of software you at least have a good reference that you can work backwards from to understand the components and optimize them.

Well instead of just using the value run a check first. Then if it’s found it’s a keyword and if not it’s a identifier token.

If you hsvue any other questions let me know and message me on discord.

that's because null is basically the same as 0. what i would do is just start the enum TokenType with a NULL TokenType.

Something like ... ``` enum TokenType{ _NULL, _NUMBER, _IDENTIFIER, _EQUALS, _OPEN_PAREN, _CLOSE_PAREN, _BINARY_OPERATOR, _LET }; ```

Thank you for your answers, really appreciate them!

There’s tons of ways to implement this. For the sake of tutorial I used a while loop constantly shifting the array down. This means the first element is the current character. However for a more performant and professional approach I would be using a while loop with helper methods that get the current token. But to be honest a while loop is still used in both cases. The reason is we don’t know how we need ti step through the source code.

Yessir

@@tylerlaceby my work buddy and I wrote a simple scripting language for a billing system back in 1996 and I was looking at our code from back then. Got me wanting to do it again, but better. Which is why I'm checking out your series. Great fun!

Circuits.

Like to implement a compiler you need a way to implement the logic. That’s fine through abstraction after abstraction in hardware and then software.

If you are still confused then feel free to reach out on discord and I can answer any questions over call xD. Cheers

Binary instruction code

I think this Ayu

@@tylerlaceby yeah it is thanks 👍

@@0xabdrahimcan’t manage to find… do you have the exact name or link? Thanks!

So you need to have Deno installed and available on your path. Furthermore you will need to install the Deno vscode extension. Once that’s installed and you are still having issues then I don’t know man. I guess you could make sure no other extension is causing issues

Yes and no. In the case of big parsers and transpiler a they use a more complex syntax and parsing stages then we will cover. However the principles of parsing still apply. But if you are looking to translate JavaScript to another language or form then this won’t be of as much help then if you are just trying to learn how to write your own custom language with its own syntax.

It’s a bit much. It could honestly be easier to just build something less abstracted away like JavaScript. But either way it would be a good project. You can go the other direction and make a text based OS in assembly and then try to get C working. It’s also super complex but honestly will be easier imo. Plus you can then use these skills more directly and te knoll the you will gain will be insurmountable.

I cannot be sure as I don’t know what code you wrote. Please feel free to contact me in my discord server and I would love to help. discord.gg/NpPDyJ6X

@@tylerlaceby i fixed it, but i need help with another error. i will join the discord

Yea that would work as well.

@@tylerlaceby Unfortunately, I just tried using it and realized that +" " == 0 and +" " == 0 are true statements for some reason. So I'll have to use whitespace checker

I honestly don’t know what your even asking.

Deno is a runtime similar to node. If you don’t have it installed then first install it.

Yes honestly a cheap keyboard off Amazon I got a few years ago. I don’t have it anymore so sadly I don’t know.

Through the terminal you use use deno. However to follow along with this series you will need deno or to modify a few io related things. But by doing so you could use ts-node and I’m sure an extension exists for that

@@tylerlaceby Thanks man

Demo is a runtime for JavaScript just like Node. It must be downloaded to follow along with the series directly. You can alter some of the code ( not much ) and use node instead if that’s easier.

@@tylerlaceby Thanks, I really appreciate it

Could you make a tutorial that converts the Deno code into Node because it keeps giving me errors whenever i try to convert it to Node

I found a way to use deno Replit has a Deno built in to the website

I downloaded deno but the extension isn't downloading. What could be the problem

First pull the code from GitHub in the video description and verify that it works. If you are still having issues then message me on discord.

@@tylerlaceby no i mean like how do you run the script what keybinds do you use to run the script?

Send me a message on discord and I can help for sure

I mentioned this a few times. It’s not meant to be fast. This is meant to be an intro to language development. Also you are very misguided if you think Go is a systems language. Go would be a poor choice also for writing a practical language in. The use of JavaScript is not to be taken as a best practice. Nor are many of tye lessons taught in this series. Instead it’s to be a simple language to follow along with while covering a typically complex topic. By using JavaScript we don’t need the learner to also be side tracked with memory management, borrow checker, lifetimes or other things which detracts from the point of the series. I’m still laughing that you think Go is a systems language lmao.

@@tylerlaceby Yes, I commented before watching to know if would be worth it, as it is a pretty lengthy series, and I have had many annoying experiences of "wow, this totally isn't what I was looking for" 3h in. And btw, you sold me on it, my worries were that it would be another case of "let's ignore the other shapes and make the circular piece fit in every hole", because there's A LOT of people who insist on using js for everything, everytime, no matter what

Deno is something which is similar to NodeJS. You need to install it

i did but it still gives the error @@tylerlaceby

I installed it how am i going to import it? @@tylerlaceby

Well I no longer use that keyboard. It was a cheap mechanical keyboard off Amazon. Now I use a Logitech MX keys.

You need to install deno to follow along. Deno is like NodeJS but a different runtime. If you use node you will have to use the node specific code when appropriate.

do i need to import deno from the deno extension? the word "deno" is still highlighted red.@@tylerlaceby

Interpreter

More precisely a tree-walk interpreter.

@@tylerlaceby So, the language you are creating in this series is an Interpreted language. Right?

Search that into google !?!?

? If you need help I will try but I need specifics. I can guarantee you that the code works.

Haha 😂

nevermind what now something different is happening $ deno run -A lexer.ts Unrecognized character found in source: ;

oh wait nevermind again its fixed

TypeScript

Cause that’s what powers the web hence the most programmers. I have a series in Go of that floats your fancy.

@@tylerlaceby don't judge me, but i use C# lol. i find it has the widest range of uses. you can even use it to make an OS(one of my current projects :)

?

You run the main.ts file xD

If you are using an older version of deno I would suggest upgrading with deno upgrade

However if that does not work then make sure the conditions are not different. Also make sure to verify the switch and default labels. If there is no break statement that could happen possibly

@@tylerlaceby Thanks it works now!

Just add me on discord and tomorrow I’ll be free to help you out in a call.

Just lookup Deno install. It's pretty simple. In also have a video on the topic too.

Yeah 😂