Closure memory management in JavaScript

memory.js

/* largeString will be included with the returned function,
  making the closure large. */
function makeLargeClosure() {
  var largeString = new Array(1000).join('0123456789');
  return function() {
    console.log(largeString);
  }
}

/* largeString isn't used in the closure, even though it's in scope.
  A reference to it won't be kept, keeping the closure small. */
function makeSmallClosure() {
  var largeString = new Array(1000).join('0123456789');
  return function() {
    console.log('Hello, World!');
  }
}

/* Even though largeString isn't used in the returned closure, 
  because it's referenced, a reference to largeString will be maintained. 
  This unnecessarily increases the size of the returned closure. */
function makeWastefulClosure() {
  var largeString = new Array(1000).join('0123456789');
  return function() {
    largeString;
    console.log('Hello, World!');
  }
}

/* The returned closure will maintain a reference to largeString
  (or any other variables accessible within makeWastefulEval) 
  when eval is used. */
function makeWastefulClosureWithEval() {
  var largeString = new Array(1000).join('0123456789');
  return function() {
    eval('console.log("Hello World")');
  }
}