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(~)

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20157

(~) 0 1 0 

const a = 5; // 00000000000000000000000000000101
const b = -3; // 11111111111111111111111111111101

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

console.log(~b); // 00000000000000000000000000000010
// : 2

js
~x

~ 2 32 NOT 32 NOT

2

NOT

x NOT x
0 1
1 0 
 9 (10 ) = 00000000000000000000000000001001 (2 )
               --------------------------------
~9 (10 ) = 11111111111111111111111111110110 (2 ) = -10 (10 )

x -(x + 1) ~-5 4

32 32 32 

Before: 11100110111110100000000000000110000000000001
After:              10100000000000000110000000000001

: ~~ x NOT 2 x 32 -2147483648 2147483647 Math.trunc()

0 1

js
~0; // -1
~-1; // 0
~1; // -2

~0n; // -1n
~4294967295n; // -4294967296n

ECMAScript 2027 LanguageSpecification
# sec-bitwise-not-operator

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MDN 2026412

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    92. ReferenceError: deprecated caller or arguments usage
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    107. TypeError: can't delete non-configurable array element
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    109. TypeError: can't set prototype of this object
    110. TypeError: can't set prototype: it would cause a prototype chain cycle
    111. TypeError: cannot use 'in' operator to search for 'x' in 'y'
    112. TypeError: class constructors must be invoked with 'new'
    113. TypeError: cyclic object value
    114. TypeError: derived class constructor returned invalid value x
    115. TypeError: getting private setter-only property
    116. TypeError: Initializing an object twice is an error with private fields/methods
    117. TypeError: invalid 'instanceof' operand 'x'
    118. TypeError: invalid Array.prototype.sort argument
    119. TypeError: invalid assignment to const "x"
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    122. TypeError: More arguments needed
    123. TypeError: "x" has no properties
    124. TypeError: property "x" is non-configurable and can't be deleted
    125. TypeError: Reduce of empty array with no initial value
    126. TypeError: setting getter-only property "x"
    127. TypeError: WeakSet key/WeakMap value 'x' must be an object or an unregistered symbol
    128. TypeError: X.prototype.y called on incompatible type
    129. URIError: malformed URI sequence
    130. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
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