Black/White maximum contrast detection

getMaxContrast.js

/**
 * Return black or white, whichever has higher contrast given the input color.
 *
 * @param {string} n - Input hexcolor without #
 * @return {string} – white or black hex value with #
 *
 * @example
 *
 *     getMaxContrast('FFFFFF') // #000000
 */
function getMaxContrast(hexcolor){
  return (parseInt(hexcolor, 16) > 0xffffff/2) ? '#000000':'#FFFFFF';
}