    camelize = function camelize(str) {  
          return str.replace(/\W+(.)/g, function(match, chr)  
           {  
                return chr.toUpperCase();  
            });  
        }  
      
    console.log(camelize("JavaScript Exercises"));  
    console.log(camelize("JavaScript exercises"));  
    console.log(camelize("JavaScriptExercises"));  