classScope.js

$ cat classScope.js
"use strict" ;

class classScope {
  constructor(item) {
    var self = this ;
    self._item = item ;
  }

  lexicalMethod() {
    console.log("Here's the item: " + self._item) ;
  }
}

var g = new classScope("1") ;
g.lexicalMethod() ;

$ node classScope.js
/Users/pivotal/tmp/t/classScope.js:10
    console.log("Here's the item: " + self._item) ;
                                      ^

ReferenceError: self is not defined