javascript get black or white text base on color

1function pickTextColorBasedOnBgColorAdvanced(bgColor, lightColor, darkColor) {
2  var color = (bgColor.charAt(0) === '#') ? bgColor.substring(1, 7) : bgColor;
3  var r = parseInt(color.substring(0, 2), 16); // hexToR
4  var g = parseInt(color.substring(2, 4), 16); // hexToG
5  var b = parseInt(color.substring(4, 6), 16); // hexToB
6  var uicolors = [r / 255, g / 255, b / 255];
7  var c = uicolors.map((col) => {
8    if (col <= 0.03928) {
9      return col / 12.92;
10    }
11    return Math.pow((col + 0.055) / 1.055, 2.4);
12  });
13  var L = (0.2126 * c[0]) + (0.7152 * c[1]) + (0.0722 * c[2]);
14  return (L > 0.179) ? darkColor : lightColor;
15}
16