Javascript Closure

Javascript Closure

// returns an object that does not itself possess "var a"
// The closure gives indirect access to a, via the public getter and setter.
function f() {
   var a = 1;

   return {
      getA: function() {
         return a;
      },
      setA: function( A ) {
         a = A;
      }
   };
}

var MyObj = new f();

alert(MyObj.a); // --> undefined
alert(MyObj.getA()); // --> 1

MyObj.setA(5);
alert(MyObj.getA()); // --> 5


function showName() {
  var name = 'Sam';
  console.log(name);
}

showName();

function celebrityID() {
  var celebID = 8978789;
  
  return {
    getID : function() {
      return celebID;
    },
    
    setID : function(newID) {
      celebID = newID;  
    }
  }
}

function empID() {
  var eId = 9999;
  
  return {
    getID : function() {
      return eId;
    },
    setID : function(newID) {
      eID = newID;
    }
  }
}

var emp = empID();
console.log(emp.getID);