dwitter-cheat-sheet

Tips and tricks I picked up from awesome dweets at Dwitter.

You can find my dweets here :)

psuedo random number generator

credit: albertveli.wordpress.com

• for(mask=0xB8,num=1,i=255;i--;console.log(num),num&1?(num>>=1,num^=mask):(num>>=1));

plotting an ellipse/circle

• for(i=1920;i--;x.fillRect(960+300*C(i),540+300*S(i),4,4)); -> x = centerX + radius * cos(angle), y = centerY + radius * sin(angle)

even/odd using & (bitwise AND)

instead of i%2==0 to get even/odd, do x&1

• 1&1 -> 1
• 2&1 -> 0
• 3.2&1 -> 1

to the power of

• 2**3 == Math.pow(2,3)

less bits to write 1000, 20000, 300000 etc...

• 1e3 -> 1000
• 2e4 -> 20000
• 3e5 -> 300000
• ...

setting (only) fontsize

x.font needs to have a font family set, or else it will ignore font size

• x.font="6em 🤷" '🤷' can be any character

shortest way to clear canvas using | (bitwise OR)

not sure how this works...

• c.width|=0
• edit: c.width^=0 seem to have the same effect, interesting. bitwise XOR.

for loops

from basic dwitter guide by Xen

• for(i=9;i--;second_thing)thing;

initiate values

If you need to initiate a value at the beginning of the loop, like for a counter.

• t||(count=0);count++
• t?run:setup (t?count++:count=0)

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credit is where credit's due

The above tips and tricks are snatched from a number of dweets. Sometimes I forgot which, or I have seen the same trick used in multiple dweets by different users. As much as possible I will try to keep track on and list dweets where I got some or multiple trick from here:

• #5132 by Erazed c.width^=0 and x.font="6em 🤷"
• t?run:setup Xen