The Nineteenth Byte

quartata

10:00 PM

And 2+2+2?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

^

Downgoat

> new CheddarEval(new CheddarShuntingYard().exec(new CheddarExpression("2+2+2", 0).exec())).exec()
< CheddarNumber { value: 6 }

@quartata ^

quartata

10/10 it's ok

El'endia Starman

What happens if you s/0/1/?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

^

feersum

10:05 PM

What happens if you s/Cheddar/Gouda ?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

the interpreter barfs

quartata

What's wrong with Gouda?

flawr

6

Q: Where to store framework code for challenges?

Some challenges are provided with some kind of framework in which the submissions should be ran in, e.g. king-of-the-hill challenges. I wrote the catch the cat challenge, which needs several files for the controller. These are currently stored as a gist. Recently I wanted to delete my github ac...

discussion

Downgoat

@El'endiaStarman then it will start parsing at index 1

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Have you defined monadic +?

Downgoat

10:17 PM

@QPaysTaxes yeah

@CᴏɴᴏʀO'Bʀɪᴇɴ yeah

quartata

Shunting-yard algorithm

In computer science, the shunting-yard algorithm is a method for parsing mathematical expressions specified in infix notation. It can be used to produce either a postfix notation string, also known as Reverse Polish notation (RPN), or an abstract syntax tree (AST). The algorithm was invented by Edsger Dijkstra and named the "shunting yard" algorithm because its operation resembles that of a railroad shunting yard. Dijkstra first described the Shunting Yard Algorithm in the Mathematisch Centrum report MR 34/61. Like the evaluation of RPN, the shunting yard algorithm is stack-based. Infix expressions...

Downgoat

@QPaysTaxes It does ShuntingYard

is converts infix -> RPN

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Downgoat What does it do?

Maltysen

@CᴏɴᴏʀO'Bʀɪᴇɴ it parses infix expressions

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I know what the algorithm is, I'm asking about the monadic case of +

Maltysen

10:19 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ lel

mınxomaτ

I read it as "shouting yard".

Cᴏɴᴏʀ O'Bʀɪᴇɴ

HEY YOU! GET OFF MY YARD!

Downgoat

@CᴏɴᴏʀO'Bʀɪᴇɴ nothing

Cᴏɴᴏʀ O'Bʀɪᴇɴ

So you haven't defined it...

Maltysen

@CᴏɴᴏʀO'Bʀɪᴇɴ what should it do?

Downgoat

10:21 PM

^

It just does return new this.constructor(this.value)

Maltysen

@QPaysTaxes absolute value?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

So, clones it?

Maltysen

why would it ever do that?

oh, I was scared for a second there

Cᴏɴᴏʀ O'Bʀɪᴇɴ

It could take the sign of something

Maltysen

@QPaysTaxes btw did your dad ever do the telemarketer app?

Downgoat

10:23 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ yeah

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Huh.

quartata

Unary plus usually has no effect whatsoever. But it's important for interaction with other unary operators

Downgoat

@quartata in what case?

quartata

> Unary "+" has no effect whatsoever, even on strings. It is useful syntactically for separating a function name from a parenthesized expression that would otherwise be interpreted as the complete list of function arguments.

From perldoc perlops

Downgoat

oh

quartata

10:27 PM

Kinda language dependent obviously but from what I've seen you might encounter similar issues in Cheddar with its unary operators/functions

so like foo+(1+2)

Yeah, exactly.

or the variable foo

@QPaysTaxes Actually, in Perl it would mean the list operator foo on the list with elements 1+2

Without the unary plus it could mean a function taking 1+2 or a list operator. (It would be parsed as a function)

I think Cheddar has a similar concept of list operators which is why I brought it up.

@QPaysTaxes Not really. It has to do with how calling a function tacitly works.

Oh, that's because there's no space:P

foo +(1+2) is that more clear?

(See this is why we have backslashes on functions/operators in Pytek)

Apr 18 at 23:24, by QPaysTaxes

@quartata What is it with you and backslashes?

now you know

Downgoat

I searched my .bash_history for the line with the highest ratio of special characters to regular alphanumeric characters, and the winner was: cat out.txt | grep -o "[[(].*[])][^)]]*$" ... I have no memory of this and no idea what I was trying to do, but I sure hope it worked.

El'endia Starman

10:32 PM

@Downgoat Ooh, okay. Why do you have that feature?

Downgoat

@El'endiaStarman In the tokenizer, the code is passed by reference, so by passing the index to parsers, I don't have to duplicate the code, I just store the index.

Alex A.

Cool language: github.com/nasser/---

Created as a way for native Arabic speakers to have intuition about the code they're writing, rather than memorizing a way to manipulate symbols that have no meaning in their language (e.g. do, for, etc.)

I think that's super cool

Maltysen

if that was his goal, a transpiler probably would have been enough…

Alex A.

¯\_(ツ)_/¯

Downgoat

@AlexA. star for JS

Downgoat

10:58 PM

What should the result be for when an array is cast to a string?

[1, 2, 3]? 1,2,3? 123? 1 2 3?

El'endia Starman

@Downgoat Ahh, neat.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Downgoat the former

Downgoat

@CᴏɴᴏʀO'Bʀɪᴇɴ [1, 2, 3]?

Alex A.

[1,2,3]

Cᴏɴᴏʀ O'Bʀɪᴇɴ

[1, 2, 3]

Yeah

Downgoat

11:01 PM

yeah, I can't read

blame hooves

Alex A.

I think it'd be better without the spaces, i.e. [1,2,3] rather than [1, 2, 3]

More compact for display

Shorter to parse

El'endia Starman

Yes, but spaces help with readability. Incidentally, Python puts spaces between elements.

Alex A.

Yeah, but that's Python. :P

Downgoat

strawpoll.me/10041043

El'endia Starman

Exactly.

Alex A.

11:03 PM

The third option is basically a war crime

El'endia Starman

One that not even Hitler was guilty of!

Downgoat

\o/ \o/ \o/ \o/ STDOUT works

Maltysen

@AlexA. is there any language that does that?

Alex A.

Not that I know of

Downgoat

@Maltysen yeah, JavaScript

quartata

11:06 PM

JS does 1, 2, 3

So no

Alex A.

JavaScript prints arrays as [ 1, 2, 3 ]?

Maltysen

@Downgoat js does some other weird shit with array string repr

Downgoat

@AlexA. in a REPL, yeah

Alex A.

:/

Downgoat

@quartata it does [ 1, 2, 3 ] in a repl

Maltysen

11:07 PM

@Downgoat which repl?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Not always

quartata

No it doesn't.

Maltysen

chrome dev console gives what quartata said

Downgoat

@Maltysen JS Shell, spidermonkey 38

Maltysen

@Downgoat well that's spidermonkey's fault

Downgoat

11:07 PM

yeah

Maltysen

but for some reason, single element arrays like [1] give 1

quartata

Technically everything wrong with JS is spidermonkey's fault

Downgoat

Anyone want to help me implement number operators in Cheddar?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

YES

what are those

Downgoat

@CᴏɴᴏʀO'Bʀɪᴇɴ ಠ_ಠ

Maltysen

11:09 PM

i'm guessing + - * / ^ %

Downgoat

yeah. but I have a lot more

ide.c9.io/vihanb/cheddar

Maltysen

@Downgoat its making me sign in

Downgoat

'!', '^', '*', '/', '%', '+', '-', '<=', '>=', '<', '>', '=', '&', '|',
'!=', ':=', '+=', '-=', '*=', '/=', '^=', '%=', '&=', '|=', '<<', '>>', '<<=', '>>=',
'and', 'or', 'xor',
// Unary operators
'-', '+',
'sqrt', 'cbrt',
'sin', 'cos', 'tan',
'acos', 'asin', 'atan',
'log', 'log2', 'log10',
'floor', 'ceil', 'round',
'len', 'reverse',
'sign',

@Maltysen yeah you need a C9 account

quartata

You can log in with GitHub.

Maltysen

@quartata cool

@quartata its giving me an error :/

whatever

Cᴏɴᴏʀ O'Bʀɪᴇɴ

11:22 PM

quartata

...

Easterly Irk

@quartata @Phrancis @Mat'sMug

HAI

Cᴏɴᴏʀ O'Bʀɪᴇɴ

HAI

Quill

oh shit I left youtube running on autoplay last night

Downgoat

@Quill nice

Quill

11:36 PM

4

Easterly Irk

@Quill roflmao

New Main Posts

0

Q: Watson-Crick palindromes

Problem Create a function that can determine whether or not an arbitrary DNA string is a Watson-Crick palindrome. The function will take a DNA string and output a true value if the string is a Watson-Crick palindrome and a false value if it is not. (True and False can also be represented as 1 a...

code-golf

Easterly Irk

@CᴏɴᴏʀO'Bʀɪᴇɴ you wanna help with FOG docs?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Sure

Easterly Irk

shit, that question has 2 answers before NMP got it. noice

Quill

11:37 PM

There's another three pages of Lana Del Ray >_<

Easterly Irk

@CᴏɴᴏʀO'Bʀɪᴇɴ :3

@Quill more roflmao

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@EasterlyIrk kk

Downgoat

@Quill well of course. A ray goes on forever in a direction

5

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I'll just write it into the wiki

Easterly Irk

I have a bit workingish

like main page

Quill

11:39 PM

Somehow it got to that from this: youtube.com/watch?v=b7xRNspm1Sg

quartata

OK, I think I'm finally about to get this working as soon as I learn how to C++ virtual correctly

Easterly Irk

I'll start on a CLA version of FOG and a page explaining it.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

CLA?

Easterly Irk

Command Line Arguements.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

oic

feersum

11:40 PM

@quartata Get what working?

Easterly Irk

ie python fog.py code input input_2 ... input_n ... rick_astley

Cᴏɴᴏʀ O'Bʀɪᴇɴ

oic

quartata

@feersum I'm trying to use Pepper to make a version of Perl for use in browsers (i.e in place of JavaScript)

Downgoat

@quartata ಠ_ಠ why would oyu ever replace javscript

Easterly Irk

^

feersum

11:41 PM

Do the standard releases of Chrom(ium) actually have that? Or do you have to build it special?

quartata

I'm pretty bad at C++ though. I much prefer plain old C

@feersum Pepper? Chrome comes with pNaCl by default I'm pretty sure

@EasterlyIrk Why are you agreeing with him?

@Downgoat because

Downgoat

JavaScript is too good?

quartata

At any rate I don't need pNaCl. I can also use pepper.js

Easterly Irk

because of javascript > perl + ∞

quartata

@Downgoat Ha, you wish.

feersum

11:43 PM

I don't get it.. how could some JS replace the ability to run native code?

quartata

@feersum Pepper.js uses emscripten

Emscripten in turn is a transpiler from LLVM instructions to JS

feersum

Ah right... I've heard of that but kind didn't believe that it actually works.

quartata

@Downgoat By the way, the fact that someone went to all the effort to make something as incredible as Emscripten so that you don't have to use JS must mean that JS really sucks

Just a thought.

Downgoat

Should & or and/AND be logical and?

quartata

& should be bitwise, && should be logical

El'endia Starman

11:44 PM

and

quartata

@feersum Same here. Pretty cool stuff.

Maltysen

^

or go the python route and use words

Downgoat

@Maltysen that is what I'm doing

Cᴏɴᴏʀ O'Bʀɪᴇɴ

And should and be case-irrespective, or should it have a fixed case?

quartata

Why do you have to have semicolons after classes?

This makes no sense

Quill

11:47 PM

you should follow the ArnoldC syntax

feersum

That's inherited from C, hehe

Quill

Or CONSIDER THAT A DIVORCE
And KNOCK KNOCK

quartata

@feersum Functions don't need semicolons after them. Structures needing semicolons makes sense because either you're using them in a typedef which is a statement or you're defining a variable with an anonymous structure

Easterly Irk

@Quill Wrong C. :P

feersum

@quartata Wait what? You're saying it makes sense but the previous message was "This makes no sense"

quartata

11:50 PM

@feersum But those are C structures I'm talking about.

C++ classes get defined all by themselves, kinda like a function

Downgoat

@quartata what language?

feersum

In C++, structs and classes are exactly the same (except the default access modifier).