Caps Each Letter In The Sentense

caps.js

//@ changing values like 'hi this is my first gist' to 'Hi This Is My First Gist';
function changeAllToCaps(string){
   return (string.split(' ').map(function(x){
              x = x.charAt(0).toUpperCase() + x.slice(1);
              return x ;
          })).reduce(function(sum,value){
                    return sum+' '+value;
          });
}