// The first argument, the condition array, is simply everything you want on the checklist. Use anything you think best describes the task.
var condition = [
  'bt1clicked',
  'bt2clicked',
  'bt3clicked'
];
// The second argument is the callback function when all the conditions are met. It is called without any arguments.
var executeWhenConditionMet = function () {
  document.getElementById('toast-snackbar').MaterialSnackbar.showSnackbar({message: 'All buttons are clicked!'});
};
// The optional third argument is a callback function when there is a progress update (when another thing gets checked off from the list). It is called with only one argument which is the percentage of total progress ranging from 0 to 1.
var executeWhenProgressUpdate = function (percent) {
  document.getElementById('progress').MaterialProgress.setProgress(percent * 100);
};
// Calling the function SETRACE returns a handle used to check off tasks.
// Use handle.set[conditionName]() to flag one task as completed.
window.foo = SETRACE(condition, executeWhenConditionMet, executeWhenProgressUpdate);