Processing.js

int m = 1 << 3;   // In binary: 1 to 1000
println(m);  // Prints "8"
int n = 1 << 8;   // In binary: 1 to 100000000
println(n);  // Prints "256"
int o = 2 << 3;   // In binary: 10 to 10000
println(o);  // Prints "16"
int p = 13 << 1;  // In binary: 1101 to 11010
println(p);  // Prints "26"

// Packs four 8 bit numbers into one 32 bit number
int a = 255;  // Binary: 00000000000000000000000011111111
int r = 204;  // Binary: 00000000000000000000000011001100
int g = 204;  // Binary: 00000000000000000000000011001100
int b = 51;   // Binary: 00000000000000000000000000110011
a = a << 24;  // Binary: 11111111000000000000000000000000
r = r << 16;  // Binary: 00000000110011000000000000000000
g = g << 8;   // Binary: 00000000000000001100110000000000

// Equivalent to "color argb = color(r, g, b, a)" but faster
color argb = a | r | g | b;
fill(argb);
rect(30, 20, 55, 55);