Closures memleak

closure_memleak.js

// Because closure is not A variable, but ALL OF THEM in dict (i.e., str, doSomethingWithStr, logIt).
// Referencing logIt in setInterval(logIt, 100) long lasts not only logIt, but also all another vars -
// for the lexical scope to be consistent.

var run = function () {
  var str = new Array(1000000).join('*');
  var doSomethingWithStr = function () {
    if (str === 'something')
      console.log("str was something");
  };
  doSomethingWithStr();
  var logIt = function () {
    console.log('interval');
  }
  setInterval(logIt, 100);
};
setInterval(run, 1000);