RGB to XY function

rgb_to_xy.js

function rgb_to_xy(red, green, blue){
    let redC =  (red / 255)
    let greenC = (green / 255)
    let blueC = (blue / 255)

    let redN = (redC > 0.04045) ? Math.pow((redC + 0.055) / (1.0 + 0.055), 2.4): (redC / 12.92)
    let greenN = (greenC > 0.04045) ? Math.pow((greenC + 0.055) / (1.0 + 0.055), 2.4) : (greenC / 12.92)
    let blueN = (blueC > 0.04045) ? Math.pow((blueC + 0.055) / (1.0 + 0.055), 2.4) : (blueC / 12.92)

    let X = redN * 0.664511 + greenN * 0.154324 + blueN * 0.162028;
    let Y = redN * 0.283881 + greenN * 0.668433 + blueN * 0.047685;
    let Z = redN * 0.000088 + greenN * 0.072310 + blueN * 0.986039;
    let x = X / (X + Y + Z);
    let y = Y / (X + Y + Z);

    return [x, y];
}