Can you keep a secret?.js

/*
There's no such thing as private properties on a coffeescript object! But, maybe there are?

Implement a function createSecretHolder(secret) which accepts any value as secret and returns an object with ONLY two methods

getSecret() which returns the secret
setSecret() which sets the secret
obj = createSecretHolder(5)
obj.getSecret() # returns 5
obj.setSecret(2)
obj.getSecret() # returns 2
*/
function createSecretHolder(secret) {
  return {
  getSecret:function(){
    return secret
    },
  setSecret:function(v){
    secret=v}
  }
}