setTimeout2.js

var log = console.log

log("Inside global execution context")

function functionOne() {
   log("Inside function one")
  
  function setTimeoutFunction() {
    log("Inside setTimeoutFunction: I will be executed after ECS become empty." +  
        "Though my waiting time is zero")
  }  
  
  // O is passed as time for setTimeout, but this method will execute only after
  // ECS is empty. As time passed is zero, as soon as it moves to Web API container
  // it will be moved to the callback message queue
  setTimeout(setTimeoutFunction, 0)
   
  for(var i = 0; i < 10000000000; i++) {
     // Blocking code. This makes the for loop to execute for more than 1 second
     // Still setTimeoutFunction is not executed. It gets executed only after 
     // last statement of the code
  }
  
  log("Exiting functionOne")
}

functionOne()

log("Exiting global execution context")