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89 lines (69 loc) · 1.8 KB
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/* In javascript there are always several ways to the goal.
Also the syntax of variable assignment can be abbreviated.
This is also suitable for bitwise operations
*/
/* left shift
*/
// Basic
y = 3 // y: 111 (binary)
x = 2
y = y << x // y: 11100 (binary)
// Shortcut
y = 3 // y: 111 (binary)
x = 2
y <<= x // y: 11100 (binary)
/* right shift (sign preserving)
*/
// Basic
y = -5 // y: 11111111111111111111111111111011 (binary)
x = 1
y = y >> x // y: 11111111111111111111111111111101 (binary) -3 (decimal)
// Shortcut
y = -5 // y: 11111111111111111111111111111011 (binary)
x = 1
y >>= x // y: 11111111111111111111111111111101 (binary) -3 (decimal)
/* right shift (zero fill)
*/
// Basic
y = 5 // y: 00000000000000000000000000000101 (binary)
x = 1
y = y >>> x // y: 00000000000000000000000000000010 (binary) 2 (decimal)
// Shortcut
y = 5 // y: 00000000000000000000000000000101 (binary)
x = 1
y >>>= x // y: 00000000000000000000000000000010 (binary) 2 (decimal)
/* AND
*/
// Basic
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y = y & x // y: 1000 (binary)
// Shortcut
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y &= x // y: 1000 (binary)
/* OR
*/
// Basic
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y = y | x // y: 1101 (binary)
// Shortcut
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y |= x // y: 1101 (binary)
/* XOR
*/
// Basic
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y = y ^ x // y: 0101 (binary)
// Shortcut
y = 12 // y: 1100 (binary)
x = 9 // y: 1001 (binary)
y ^= x // y: 0101 (binary)
/* NOT
*/
// Basic
y = 5 // y: 00000000000000000000000000000101 (binary)
y = ~y // y: 11111111111111111111111111111010 (binary) -6 (decimal)