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Bitwise.md

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Bitwise Operator

  • JavaScript에서 bitwise operator을 사용할 셩우 피연산자는 32비트 정수로 변환된다.
  • 32비트 이상인 숫자는 최상위 비트가 삭제된다.
Before: 11100110111110100000000000000110000000000001;
After: 10100000000000000110000000000001;

Unsigned Right shift(>>>)는 있지만 Unsigned Left shift는 없다. 다른 언어들도 Unsigned Left shift는 없다. 어차피 0으로 수렴되기 때문에 Left Shift와 차이가 없기 때문이다.(참고)

AND Operator(&) 
const a = 5;        // 00000000000000000000000000000101
const b = 3;        // 00000000000000000000000000000011

console.log(a & b); // 00000000000000000000000000000001
// expected output: 1
OR Operator(|) 
const a = 5;        // 00000000000000000000000000000101
const b = 3;        // 00000000000000000000000000000011

console.log(a | b); // 00000000000000000000000000000111
// expected output: 7
NOT Operator(~) 
const a = 5;     // 00000000000000000000000000000101
const b = -3;    // 11111111111111111111111111111101

console.log(~a); // 11111111111111111111111111111010
// expected output: -6

console.log(~b); // 00000000000000000000000000000010
// expected output: 2
XOR Operator(^) 
const a = 5;        // 00000000000000000000000000000101
const b = 3;        // 00000000000000000000000000000011

console.log(a ^ b); // 00000000000000000000000000000110
// expected output: 6
Left shift(<<) 
const a = 5;         // 00000000000000000000000000000101
const b = 2;         // 00000000000000000000000000000010

console.log(a << b); // 00000000000000000000000000010100
// expected output: 20
Right shift(>>) 
const a = 5;         // 00000000000000000000000000000101
const b = 2;         // 00000000000000000000000000000010

console.log(a >> b); // 00000000000000000000000000000001
// expected output: 1
Unsigned Right shift(>>>) 
const a = 5;          //  00000000000000000000000000000101
const b = 2;          //  00000000000000000000000000000010
const c = -5;         //  11111111111111111111111111111011

console.log(a >>> b); //  00000000000000000000000000000001
// expected output: 1

console.log(c >>> b); //  00111111111111111111111111111110
// expected output: 1073741822