Вспоминаю битовые операции

A = 1;
1
B = 1 << 1;
2
C = 1 << 2;
4
D = 1 << 3;
8
A.toString(2)
"1"
B.toString(2)
"10"
C.toString(2)
"100"
D.toString(2)
"1000"
(A | B | C | D).toString(2);
"1111"
((A | B | C | D) ^ A).toString(2)
"1110"
((A | B | C | D) ^ B).toString(2);
"1101"
(A | C | D) & B
0
(A | C | D).toString(2) + ' & ' + B.toString(2)
"1101 & 10"
1000 & 255
232
10 & 255
10
256 & 255
0
257 & 255
1
(256 * 256 * 256) - 1;
16777215
16777215 == 0xffffff
true
function int2hex(n) { var str = ''; var chars = '0123456789ABCDEF'; /* 16 units */ while (n) { str += chars[n & 15 /* n & 0xf */]; n >>= 4;  } return str;  }
undefined
int2hex(255);
"FF"
rgb = 0xb7f266;
12055142
r = (rgb >> 16) & 255
183
g = (rgb >> 8) & 255;
242
b = (rgb >> 4) & 255;
38