Nice random color generator

randomcolors.js

var colorCache = Array();
function randomColor() {
  const r = () => 200 + Math.floor(56 * Math.random()); //Strong color
  var rl = Array();
  do {
    rl[0] = r();
    rl[1] = r() - 50 - Math.floor(206 * Math.random()); // Clearer defined color
    rl[2] = r() - 50 - Math.floor(50 * Math.random());
    rl.sort(function() {
      return 0.5 - Math.random();
    });
  } while(!validColor(rl));
  rl[0] -= 40;
  //Negative not handled, if needed bring it to Zero
  return rl;
}

function validColor(rl) {
  if( ((rl[0]+rl[1]+rl[2])<350)){ //Color brightness
    if(colorCache.length != 0){ //Cache not empty
      if(colorCache.indexOf(Math.max(...this.colorCache)) == rl.indexOf(Math.max(...rl)) ){ //not same base color
        return false;
      }
    }
    this.colorCache = rl;
    return true;
  }
  return false;
}