Problem

You are given coordinates, a string that represents the coordinates of a square of the chessboard. Below is a chessboard for your reference.

Return true if the square is white, and false if the square is black.

The coordinate will always represent a valid chessboard square. The coordinate will always have the letter first, and the number second.

Example 1:

Input: coordinates = “a1” Output: false Explanation: From the chessboard above, the square with coordinates “a1” is black, so return false.

Example 2:

Input: coordinates = “h3” Output: true Explanation: From the chessboard above, the square with coordinates “h3” is white, so return true.

Example 3:

Input: coordinates = “c7” Output: false

Constraints:

coordinates.length == 2 ‘a’ <= coordinates[0] <= ‘h’ ‘1’ <= coordinates[1] <= ‘8’

Pre analysis

If its odd base, ‘a’, ‘c’, ‘e’, ‘g’ then it will be the num mod 2 , else it will be opposite of num mode 2

Another solution

using logical xor

var squareIsWhite = function (coordinates) {
  const charCodeSum = coordinates.charCodeAt(0) + coordinates.charCodeAt(1);

  return (charCodeSum & 1) === 1;
};