The Sand Trap

Aiden Chow

00:20

ap scores have been out for a while, what yall get on ur ap tests if u took one?

lyxal

01:35

0%

But also 100%

And 420.69%

Aiden Chow

yes, seems very accurate, considering that ap tests are scored on a 1 to 5 scale

and also u didnt specify which ap tests u took :P

well i got a 4 on calculus BC :|

Unrelated String

f

Aiden Chow

well i can still take it again next year, so its not too bad

but i was hoping to get a 5 this year and get it out of the way

also 3 on chem

i blame it on the practice tests, they were easier than the actual test

:P

Unrelated String

wait did you not practice on old actual tests

Aiden Chow

@UnrelatedString i dont think the full tests are available, tho i did take a look at the old free response q's

Unrelated String

01:50

could have sworn there were like one or two years of multiple choice when i was doing them

but it might even vary by subject

Aiden Chow

eh couldnt find them

had to rely on practice tests from ap books for multiple choice

which turned out to be easier than the actual exam cuz i felt like i didnt know half the shit on the test

Unrelated String

f

Aiden Chow

well, at least i got one 5 this year

on ap chinese :D

Unrelated String

nice

lyxal

@AidenChow I didn't :p

user

01:59

@AidenChow that’s great!

especially since (no offense) you seem to be a kid

4 should get you credit in most colleges

Aiden Chow

@user ummmmm, idk, 13 yrs old = kid?

user

Yeah that’s really impressive

lyxal

@AidenChow I'm an uni student in Australia, why would I even need to be taking APs lol?

AP is for getting into college, yes?

user

when i was 13 i could barely add two digit numbers

Steffan

what on earth

Aiden Chow

02:01

@lyxal for fun? :P

Steffan

I could easily do that when Iw as like 8 or 9

user

@lyxal well it’s more for getting ollege credit while in school (much cheaper and saves time)

lyxal

@user I was a scratch animator at 13 :P 13 is also the age I first touched JS

Steffan

I first touched JS at like 7 or 8 :P

lyxal

@user well see that's the thing - I'm not in school :p

user

02:02

But yeah you could totally try to woo colleges with good AP scores

Aiden Chow

dang yall flexing ur programming skills, idek any js and im already 13

Steffan

lol

user

@lyxal well you’re also not American so it’d be useless for you

Steffan

The first thing I touched was PHP

lyxal

@AidenChow I'm not flexing I didn't know what I was doing with js

user

02:03

@AidenChow kid

lyxal

All I did was touch it

user

you are a kid

do not spoil your innocence

Aiden Chow

the only "programming language" im proficient at is a fricking graphing calculator :\

user

avoid js

Steffan

JS is the best language

[] == 0

whic is awesome

lyxal

02:04

@AidenChow I didn't really start knowing what I was doing until I was 15

Aiden Chow

@Steffan how does []==0 ????

that literally makes no sense

user

(In all seriousness, it’s definitely not too late to pick up programming)

Steffan

@AidenChow well first stringify [], which is ""

Aiden Chow

stringify? u mean convert to a string?

Steffan

yeah

wait a sec

Aiden Chow

02:05

ok that is weird

user

@Steffan weird i thought js truthiness was more cursed than that

Steffan

it is about that bad

user

Wait nvm if it stringifies that’s adequately cursed

Steffan

Then it converts "" to an integer: 0

and 0 == 0

user

This is php level stupidity

i love it

lyxal

02:06

Wait why doesn't [] stringify as "[]"?

Steffan

It separates by commas

Aiden Chow

@lyxal LOL yeah thats what im thinking

Steffan

lyxal

@Steffan this is some weird ass flatprinting shit

user

@lyxal it’s like “”.join([]) afaict

Steffan

02:07

Me spitting technical advanced docs at y'all JS noobs

Aiden Chow

and like why does it convert to string then integer???? thats cursed

user

I’m going to have nightmares :p

Steffan

so ['hello',2,[3,['a']]] stringifies to hello,2,3,a

@AidenChow it's just terrible

user

Wut

Steffan

developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

user

02:08

@Steffan oh wait that makes sense

lyxal

@Steffan ah yes just flatten completely

Excellent

Steffan

When comparing an array with a primitive, it stringifies the array, and if they're still different types, it converts to the same type

Aiden Chow

@Steffan damn that actually kinda maybe seems useful

user

But which kind of idiot decided to not print lists with brackets?

Steffan

So '' == 0 because the rules say don't stringify the number, but numberify the string

@AidenChow it has been useful in golfing

user

02:09

@AidenChow it seems like it’d just be confusing lol

Aiden Chow

@Steffan yea expected

lyxal

@user looks at jelly

Aiden Chow

@user ikr

user

Oh golf

Yeah cursedness is great here

ut not put side of chcc

Aiden Chow

all these golfing langs here are like waaaay too confusing for me, they look like gibberish

Steffan

02:10

developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

user

Og god u’m haing s zeizur

Dave ne

lyxal

U good bro

user

Bo

Steffan

It literally actually does join(',') under the hood

lyxal

@user yikes

user

02:11

I vanot typ

Aiden Chow

@Steffan yo what

thats like not ok

lyxal

@user One key at a time

I believe in you

user

Te js us sptedig

T

H

E

J

Steffan

So you can do ({ join: () => 'my string' }).toString() and it will literally return my string

user

S

I

S

Aiden Chow

02:12

@Steffan cant read js at all but looks terrible

lyxal

@user the js is spreading?

Steffan

Coercion is terrible. The golden rule is to never ever use == unless you're golfing

user

S

Steffan

Always use ===

=== takes coercion and throws it in the garbage

Aiden Chow

so... ppl use this lang to make websites??

user

02:13

@lyxal ye

Steffan

yep

So [1, 2, 3] !== "1,2,3" even if [1,2,3] == "1,2,3"

lyxal

@user that badly?

Steffan

But the thing is, if they're the same type, it won't coerce. So [1,2,3] != [1,2,3]

user

@AidenChow it’s actually not terrible as long as you stick to the good parts

lyxal

@AidenChow looks in static folder so it would seem

Aiden Chow

02:14

@Steffan wait what?

user

Where good parts == small subset of typescript

Steffan

@AidenChow Arrays and objects use memory references

Aiden Chow

im so confused, they look exactly the same

user

@Steffan reference equality?

Aiden Chow

@Steffan this just seems paradoxical

Steffan

02:15

@user Exactly

It checks by the memory reference

Just like Python's is

lyxal

@AidenChow there's at least 3 javascripts on our site

user

@AidenChow no it compares whether it’s the exact same object

Like two identical twins != each other even if they have the same properties

Aiden Chow

bruh ok

why they do dat

thats just stupid

Steffan

Only with non-primitives

user

@lyxal y

Steffan

02:16

Arrays and objects

user

@AidenChow ephishunsee

Steffan

Object.is does really really strict comparison

lyxal

You were doing so well too

user

It does kinda make sense ig?

Aiden Chow

@Steffan that still sounds stupid

Steffan

02:17

So Object.is(-0, 0) is false

Even though -0 === 0

@AidenChow Python works the same way if you use is

Aiden Chow

bruh -0, never seen that in my life

is it like -epsilon, mathematically

Steffan

-0 is a different memory reference than 0 for some reaosn.

Aiden Chow

huh

user

@lyxal spïक़rÿæā‘ग़

Aiden Chow

@user da fuq

user

02:19

@Steffan no

इट्स आ double

Steffan

JS uses IEEE 754 which can have -0

user

फ़किंग keyboard

@Steffan exactly

Steffan

tc39.es/ecma262/#sec-numeric-types-number-sameValue

user

इट्स नोट आ मेनोर्य reference

wtf

Steffan

user

02:20

It’s not q ´mort reference

Steffan

Only Object.is and a few other things use sameValue though, so usually 0 === -0

Aiden Chow

@Steffan what is boldface F?

user

It’s just how doubles zork

*It’s not q menoty reference i ´eqn

Aiden Chow

F means float?

Steffan

I think so

user

02:21

^

Steffan

Floats can have -0 and 0 by IEEE 754

Aiden Chow

but like... why do they even distinguish between -0 and +0, that is so weird

that should definitely be fixed or smth

user

Zell

Not qll platforms hqve signed wero

Steffan

Only Object.is says -0 and 0 are different. You'll never run into problems.

user

But yeah it’s annoying

Steffan

02:23

I guess I need to show you the good sides of JS or you'll never touch it in fear :P

user

Possibly because it ´akes equality checking easier?

Aiden Chow

how would u even encounter -0 through arithmetic

like -1 * 0?

Steffan

just a sec

user

@Steffan we’re kinda forced to touch it

Steffan

210

Q: Are +0 and -0 the same?

Reading through the ECMAScript 5.1 specification, +0 and -0 are distinguished. Why then does +0 === -0 evaluate to true?

javascript

23

A: Are +0 and -0 the same?

I just came across an example where +0 and -0 behave very differently indeed: Math.atan2(0, 0); //returns 0 Math.atan2(0, -0); //returns Pi Be careful: even when using Math.round on a negative number like -0.0001, it will actually be -0 and can screw up some subsequent calculations as shown a...

You should never get -0 from arithmetic.

1/-0 is -Infinity, but 1/0 is Infinity

Aiden Chow

02:25

whack

user

@Steffan me when -0*1==-0

Steffan

That's the only known way to differntiate them other than Object.is, and atan2

Aiden Chow

but can -0 just pop up as some output in ur code, without u actually writing it

user

Ye

Aiden Chow

thats whack

PyGamer0

03:49

@user LOL

NoHaxJustRadvylf

14:02

@AidenChow It's a really neat feature IMO

It's the only elegant way to make 1 / 0 not error (or NaN)

DLosc

17:31

I enabled the Windows feature that shows the current weather in the taskbar, because I thought it would be nice to see at a glance what it's like outside. But now I'm having second thoughts:

@NoHaxJustRadvylf I'm still trying to decide which I think is better: having -0, or not having -Infinity. Both options are kinda cursed in different ways.

user

17:46

-Infinity is definitely distinct from +Infinity, though

Although having +/-Infinity and NaN is kinda weird, I guess

Division by 0 should be an error in most contexts

NoHaxJustRadvylf

Any time Infinity shows up in floating point math, it's a reasonable answer when you stick a lim in front of whatever you're calculating

And that's a really useful shorthand in plenty of cases

Plus, having things like tan not error is super useful

Unrelated String

^

and even when it is logically an error it can be helpful for it to exist as a value

Steffan

18:22

@DLosc Ikr, often for me it shows, like "rain stopping in 15 minutes" but it hasn't rained the whole day or yesterday

emanresu A

21:34

NoHaxJustRadvylf

23:15

Me when match statement:

user

23:28

@Steffan Obviously, you live in a simulation :P

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