destroyingObject.js

var objRef = function(val){
  console.log(val) // will return passed var
  var val = 'baz' // redefining the value of this var within this block
  this.destroy = function(){ // defining an object of objRef that can be called using objRef.destroy()
    assert(objRef) // this will not work because the compiler has no knowledge of objRef in this scope     
  }  
}
var foo = 'bar' // define a test var
objRef(foo) // pass our var to the object

there is no way to redefine the value of an object within itself, variable definition must be done in the scope the variable is defined