New #stamp dweets

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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ElisionFR

function u(t) {

c.style.cursor='none'
c.width=innerWidth
m=e=>x.fillText('🐁',e?.x,e?.y)
onclick=e=>{c.a=[e].concat(c.a)}
onmousemove=e=>R=e
c.a?.map(m)
m(R)

Feb 23 2020 9:11 PM UTC

}// 140/140

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u/ElisionFR

Any idea why if I replace "R" by "j" in this script I get a "j is not defined" error ?
u/ElisionFR

God I'm an idiot R is defined as a function by Dwitter....
u/tomxor

nah, i led you down that rabbit hole... using a predefined object (in this case a function, doesn't really matter), is a way to not have to check the object exists to access properties. But you've discovered the new nullish collescing operators :D I can't run this yet cos chrome 80 hasn't landed in debian. looks like it still requires more chars than using existing objects though.
u/tomxor

Hmm, getting a syntax error for browsers who don't support the syntax seems to permantently break the dweet, I have to copy paste to manipulate it.

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