Coderbyte challenge.

lettercap.js

function LetterCapitalize(str) { 
    var temp = str.split(" ");
    
    function Capitalize(value){
        var result = value.charAt(0).toUpperCase();
        var substring = value.substring(1, value.length);
        var final = result+substring;
        return final;
    }
    
    var final = temp.map(Capitalize).join(" ");
      
  return final; 
         
}