Page 155 - JavaScript

13 & 7 => 5
// 13: 0..01101
// 7: 0..00111
//-----------------
// 5: 0..00101 (0 + 0 + 4 + 0 + 1)

Real world example: Number's Parity Check

Instead of this "masterpiece" (unfortunately too often seen in many real code parts):

function isEven(n) {
return n % 2 == 0;
}

function isOdd(n) {
if (isEven(n)) {
return false;
} else {
return true;
}
}

You can check the (integer) number's parity in much more effective and simple manner:

if(n & 1) {
console.log("ODD!");
} else {
console.log("EVEN!");
}

Bitwise OR

The bitwise OR operation a | b returns the binary value with a 1 where either operands or both
operands have 1's in a specific position, and 0 when both values have 0 in a position. For example:

13 | 7 => 15
// 13: 0..01101
// 7: 0..00111
//-----------------
// 15: 0..01111 (0 + 8 + 4 + 2 + 1)

Bitwise NOT

The bitwise NOT operation ~a flips the bits of the given value a. This means all the 1's will become
0's and all the 0's will become 1's.

~13 => -14
// 13: 0..01101
//-----------------
//-14: 1..10010 (-16 + 0 + 0 + 2 + 0)

https://riptutorial.com/ 112