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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Current theme challenge: #Food

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KilledByAPixel

remix of d/31992 by u/KilledByAPixel

function u(t) {

c.width|=s=5
for(i=1e3;i--;x.ellipse(960,(k-!j-t%2)*300,300,99,0,a=(j-!!j*1.5+k/2+t%1+(i>>2)%s)/s/.159,a))j=i%4,k=i/(4*s+4)|0
x.stroke()

Jun 17 2024 12:31 PM UTC

}// 136/140

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Vector Tube 🧪 Change s to control number of sides

u/cantelope

cool

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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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taupelink

remix of d/11655 by u/Undefined

function u(t) {

l=(n,a)=>(a.push(n),n-1?l(n%2?n*3+1:n/2,a):a)
c.width|=0,k=0,b=l(~~t+2,[]),m=(Math.max(...b)/99)|1
b.forEach(X=>x.fillRect(k++*20,0,20,X/m))

Jun 7 2019 2:21 AM UTC

}// 140/140

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Mini #collatz, adapted for column graphs #math

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rodrigo.siqueira

function u(t) {

x.fillRect(x.globalAlpha=.05,0,2e3,2e3)
for(i=968;i--;)for(j=22;j--;x.clearRect(960+S(k=i/5)*r,540+C(k)*r+j*35-360,3,3))r=2*j*T(j)|T(i*j*t)

Dec 21 2025 11:04 PM UTC

}// 139/140

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Cosmic sacred geometry

u/ximavus

I see vertical maldenbrot set

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Inkbox

function u(t) {

x.fillStyle=R(Math.random()*255,Math.random()*255,Math.random()*255,255);
x.fillRect(Math.random()*1920,Math.random()*1080,t*2,t*2);

Jan 7 2018 4:39 PM UTC

}// 132/140

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scottglz

function u(t) {

w=c.width=255;h=144;d=x.getImageData(0,0,w,h);b=d.data;for(i=3;i<w*h*4;i+=4,b[i]=C(i/(t%6+29))*w+h,b[i-2]=C(t)*i/w );x.putImageData(d,0,0)

Feb 27 2017 10:36 PM UTC

}// 138/140

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kian

remix of d/21922 by u/kian

function u(t) {

c.style.filter=`invert(`
w=c.width=99
for(var i=1e3;i--;x.fillStyle=R(X,Y,t<<w))x.fillRect(X=i**S(t)%w,Y=6+(i*1)/w-C(X/t)*7,C(w*i^X),t/X)

Mar 12 2021 6:25 PM UTC

}// 137/140

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Paint ' o ' Bridgy

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luta

remix of d/35961 by u/luta

function u(t) {

eval(unescape(escape`󭌿󨼮󭽩󩍴󪌽󜜸󜌺󩌽󦌽󦜽󜜻󩭯󬬨󪜽󜬰󞜻󪜭󛜻󮌮󩭩󫍬󥍥󮍴󚍩󛝘󛜱󞜪󦜿󪜥󜼪󪜥󞌾󜜿󘭜󭝄󞌳󠽜󭝄󡬳󜬢󞬢󘬺󘭜󭝄󞌳󡍜󭝄󠼳󜌢󛍩󙜱󞜪󞜬󚌱󚽩󛼱󞝼󜌩󚬹󚜩󫽮󪽥󮝤󫽷󫬽󩜽󟬨󪼽󩜮󭽨󪝣󪌥󜼪󜬭󜜩󟌳󟽤󚼽󪼺󚍘󚼽󤼨󩬽󩌪󛬷󞌵󝌩󛼮󝭼󜌬󦜫󟝃󚍦󚜯󛬶󯌰󚜻`.replace(/u../g,'')))

Jul 25 2026 12:19 AM UTC

}// 140/140

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Bunny maze #interactive

u/luta

Bunny is heading southeast, use arrow keys to move or turn 45 degrees and don't bump into trees.

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magna

remix of d/27939 by u/rodrigo.siqueira

function u(t) {

for(c.width=A=128;A;(X^R)%7?R+=.1:T++<48?x.fillRect(A+3,36+T/R-z+9/t,T/96+-.5,2/R):(u=--A/64-1,R=1,T=-48))X=R*u+t,z=X*35+R,z=(z-T^T+z)%7>5

Jun 10 2023 7:40 PM UTC

}// 138/140

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Misty floor lazy remix

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dee-gomma

remix of d/34124 by u/rodrigo.siqueira

function u(t) {

for(c.width|=n=0,m=26-6*C(t);n<m;n+=.05)for(i=7;i--;x.fillRect(960+S(a*2-i*.9+t)*m*26*S(1-a),0|m*n,99*a,3))x.fillStyle=R(j=20*i+80,a=n/m,j)

Jul 15 2025 7:43 AM UTC

}// 139/140

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u/cantelope

wow