Tail Recursion in Node.js

tail_recursed_loop.js

start_date = Date.now()
old_date = start_date
seconds_running = 120

console.log('Starting Program at: ' + Date())

loop_flag = true
loop()

function loop() {

  tick();
  if(loop_flag) {
    timeOut = setTimeout(loop, 1000);
  }
}

function tick() {
  
  new_date = Date.now()

  // Execute this for just 30 seconds
  if( (new_date - start_date) < 1000 * seconds_running) {    

    diff_tick = new_date - old_date  
    console.log('tick with difference : ' + diff_tick)
    old_date = new_date
  }
  else {
    console.log('Reached ' + seconds_running +' seconds at: ' + Date() )
    loop_flag = false
  }
}