Random dweets | Dwitter

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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jonathan_b

remix of d/6494 by u/magna

function u(t) {

x.fillRect(0,0,2e3,2e3);for(i=8;i--;)for(x.setTransform(1,0,0,1,i%2*920,(i>>2)*500),j=99;j--;)x.clearRect(500+C(j)*250,290+S(j+i*t)*200,9,9)

Jan 28 2018 12:09 AM UTC

}// 140/140

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pavel

function u(t) {

g=_=>2*Math.random()-1;Y=g(X=g(r=512));h=X*X+Y*Y<=1
x.fillStyle=R(a=99+!h*99,a,a);x.fillRect(r+r*X,r+r*Y,32,32)
t?0:n=d=0;throw 4*(n+=h)/++d

Oct 27 2018 3:13 AM UTC

}// 140/140

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Estimating Pi using the Monte Carlo Method

u/katkip

Genius!
u/pavel

#pi

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384.cz

function u(t) {

throw 052

Dec 19 2023 6:15 PM UTC

}// 9/140

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How?!

Show more comments…
u/danny@hille.dk

prefixing any number with 0, and javascript interpret it as octodecimal (base 8) jist like prefixing with 0x nd javascript interpret it as hexadecimal (base 16)
u/Odog8

100% worst js feature
u/danny@hille.dk

It's a C language feature that bleed in Java, and from Java into javascript
u/Odog8

ah, didnt know that, neat. Still frustrating imo
u/New_Core

there is 0o for octal.. if use just 0 and accidently have a 8 or 9, it becomes a normal decimal while 0o will throw an error. as said before, you have 0b = binary 0o = octal 0x = hexa
u/rodrigo.siqueira

oh no, 078 throws "78" and 077 throws "63".
u/neimad

077/078 is not a really a gotcha. It seems to follow Javascript's patterns for type coercion. Some numbers can evaluate as octal numbers, and some can't. If a string starts with 0 and contains only numbers 0 through 7, then it is evaluated as octal. If the string starts with 0 and has any number above 7 (not octal), then it evaluates as decimal. It's not a mystery, it actually makes some sense even if octal in Javascript is not normally used.
u/tomxor

On the rare occasion when you need to set file permissions from JS you will finally appreciate it :D

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pat

function u(t) {

p=Math.floor(Math.random()*3);a=t>1?p==0?(a+400)/2:p==1?(a+1400)/2:(a+900)/2:900;b=t>1?p==2?(b+140)/2:(b+1000)/2:570;x.fillRect(a,b,5,5);

Sep 27 2016 10:48 PM UTC

}// 137/140

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u/iverjo

Nice approach!

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Xen

function u(t) {

for(j=0;j<9;++j){x.fillStyle=`hsl(${Z=t*t%255},99%,50%`;for(i=9;i--;x.fillRect(960+S(p=t/j+9*i-S(t)/(j%2?-2:2))*Z*j,540+C(p)*Z*j,p,p));}

Aug 31 2017 9:29 PM UTC

}// 136/140

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a failed attempt to golf one of cantelopes...

u/cantelope

looks like a win to me :D
u/Xen

https://codegolf.tk/a/44
u/Xen

i gave up keeping it the same at 200bytes lol, i'm too lazy

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erin

remix of d/21426 by u/Pascal

function u(t) {

c.width=w=70;for(i=2800;i--;)x.fillRect(X=i%w,Y=(i-X)/w,0<C(T(S(X/7+5*C(Y/7-5*t/i))+S(Y/7-5*t))),1)

Jan 24 2021 9:51 PM UTC

}// 99/140

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Nike, but animated...?

u/Qwitter

cool

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rodrigo.siqueira

remix of d/12312 by u/robbyg

function u(t) {

c.width|=B=(X,Y,A,L,h,v)=>L>7&&(x.lineTo(h=X+C(A)*L,v=Y-S(A)*L),B(h,v,A-t/8,L*.73),B(h,v,A+t/2,L*.73))
B(800,890,1,260)
x.stroke()

Feb 12 2019 10:36 PM UTC

}// 130/140

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Plants, thorns and dragon curves #fractal

u/katkip

Wow! Amazing
u/robbyg

I was hoping someone would come up with something better to do with that function. Awesome! :)

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katkip

remix of d/12197 by u/katkip

function u(t) {

c.width*=1
for(i=9;i--;)for(j=50;j--;)for(k=20;k--;)x.fillRect(400+i*100+S(t*5)*300+j+S(k+t)*S(t*5)*99,400+C(j+i*22)*S(t*5)*29+k*10,2,15)

Feb 6 2019 9:07 AM UTC

}// 137/140

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#default but shuttered

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function u(t) {

x.drawImage(c,i=0,s=8)
a=t?a:[...S+0].map(i=>i<'_')
b=[]
while(i<240){d=b[i]=a[i-1]^a[i+1]
x.fillStyle=R(!d<<8)
x.fillRect(i++*s,0,s,s)}a=b

Jan 27 2018 4:28 PM UTC

}// 139/140

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josehcls

function u(t) {

  c.width=1920;
  for(i=0;i<70;i++){x.fillStyle=R(0,S(i)*S(i)*255,C(i)*C(i)*255)
  x.fillRect(-60+i*30,C(4*t+(i*2))*300,200,1000)}

Dec 27 2017 12:21 PM UTC

}// 130/140

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