Some basic functions for the bitwise operations

bitwise.basic.js

 // right shift of 0 makes the num unsigned: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
const numToBinary(num) => (n >>> 0).toString(2);

const lowBit = (n) => n & -n; // returns the sub-number which is the last 1 in binary of the original number
// low Bit operation is used in "Binary indexed Trees"
// https://zh.wikipedia.org/zh-hans/%E6%A0%91%E7%8A%B6%E6%95%B0%E7%BB%84