Custom Functions

Functions in java script have the following structure 

Syntax

function <nameOfTheFunction> (<parameterA>, <parameterB>, ...) {
   // Some code here
   return *some value to return*;
}

Sample

function countA () {
   var phrase = prompt("Type a phrase to be analized");
   if ( typeof(phrase) != "string"){
      alert("that is not a valid Entry!");
      return false;
   } else {
      var aCount = 0;
      for (var index = 0; index < phrase.length; index++){
         if (phrase.charAt(index) == "e" || phrase.charAt(index) == "E"){
            aCount++;
         }
      ​}
      alert("There are "+aCount+" A's in : "+phrase+"");
      return true;
   }
}