The &= operator performs bitwise AND on the two operands and assigns the result to the left operand.
The &= operator performs bitwise AND on the two operands and assigns the result to the left operand.
x &= y
x &= y is equivalent to x = x & y, except that the expression x is only evaluated once.
let a = 5; // 5: 00000000000000000000000000000101 // 2: 00000000000000000000000000000010 a &= 2; // 0 let b = 5n; b &= 2n; // 0n
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_AND_assignment