Object-Oriented JavaScript - Third Edition

Chapter 3, Functions

Lets do the following exercises:

Exercises

1. To convert Hex colors to RGB, perform the following:

           function getRGB(hex) { 
             return "rgb(" + 
               parseInt(hex[1] + hex[2], 16) + ", " + 
               parseInt(hex[3] + hex[4], 16) + ", " + 
               parseInt(hex[5] + hex[6], 16) + ")"; 
           } 
           Testing: 
           > getRGB("#00ff00"); 
                  "rgb(0, 255, 0)" 
           > getRGB("#badfad"); 
                  "rgb(186, 223, 173)" 
   

   One problem with this solution is that array access to strings like hex[0] is not in ECMAScript 3, although many browsers have supported it for a long time and is now described in ES5.

   However, But at this point in the book, there was as yet no discussion of objects and methods. Otherwise an ES3-compatible solution would be to use one of the string methods, such as charAt(), substring(), or ...