Checking the presence or absence of elements
You can use bit masking to check the presence or absence of specific elements in a collection.
Example:
Javascript
const geek = [2, 8, 13, 9, 7, 13]; let bitmask = 0; for (let i = 0; i < geek.length; i++) { bitmask |= 1 << geek[i]; } const numberToCheck = 6; const isNumberPresent = (bitmask & (1 << numberToCheck)) !== 0; console.log(isNumberPresent); |
Output
false
What is Bitmasking in JavaScript ?
Bitmasking in JavaScript refers to the manipulation and usage of bitwise operators to work with the binary representations of numbers and It is a technique commonly used to optimize certain operations and save memory in various algorithms Bitwise operators in JavaScript operate on individual bits of binary representations of the numbers rather than their decimal representations.
The numbers are represented in binary form, which consists of 0s and 1s. Bitmasking allows you to manipulate specific bits of these binary representations using bitwise operators like AND, OR, XOR, NOT, left shift, and right shift.