RGB To Hex Conversion.js

/*
Description:
The rgb() method is incomplete. Complete the method so that passing in RGB decimal values will result in a hexadecimal representation being returned. The valid decimal values for RGB are 0 - 255. Any (r,g,b) argument values that fall out of that range should be rounded to the closest valid value.

The following are examples of expected output values:

rgb(255, 255, 255) // returns FFFFFF
rgb(255, 255, 300) // returns FFFFFF
rgb(0,0,0) // returns 000000
rgb(148, 0, 211) // returns 9400D3
*/

const rgb = (r, g, b) => toHex(r) + toHex(g) + toHex(b);

function toHex(numb) {
  if (numb <= 0)   return '00';
  if (numb > 255)  return 'FF';
  return numb.toString(16).toUpperCase();
}