Function to determine if a hex color is light (crude)

light.js

function isLight(hex) {
  let vals = hex.substring(1).split('').map((h, i) => {
    if (!/^\d+$/.test(h)) {
      h = parseInt(h, 16)
    }
    return parseInt(i % 2 < 1 ? h * 16 : h)
  })
  return vals.reduce((n, x) => n + x) > (765 / 2)
}

/* Usage
const isLight = isLight('#fffccc');
*/