Bitwise AND of Numbers Range

Problem Description

Given two integers left and right that represent the range [left, right], return the bitwise AND of all numbers in this range, inclusive.

Example 1:

Input: left = 5, right = 7
Output: 4

Example 2:

Input: left = 0, right = 0
Output: 0

Example 3:

Input: left = 1, right = 2147483647
Output: 0

Constraints:

• 0 <= left <= right <= 231 - 1

Solution (JavaScript)

/**
 * @param {number} left
 * @param {number} right
 * @return {number}
 */
var rangeBitwiseAnd = function(left, right) {
    if (left === right) return left;
    const nextTwoPower = 2**Number(left).toString(2).length;
    if (nextTwoPower <= right) return 0;
    let res = left;
    for (let i = left+1; i <= right; i++) {
        res = res&i;
    }
    return res;
};