Timed loop: jump to next iteration only if external conditions are met

timed_loop.js

// run a loop
// that jumps on the next iteration only after an external condition is met

// -> a poller checks on the condition every 100 ms and the iteration goes on only if certain conditions are met

// inspiration ->
// https://medium.com/@eric.stermer/setinterval-simply-put-is-a-timed-loop-652eb54bd5f8

// the `products` variable is defined elsewhere

// index
var i = 0;

// check if an asynchronous event has modified the specific item
var checkOnExternalConditions = function (i) {
  return products[i].init === true;
};
 
// call the function on the specific item
var mainFunction = function (i){
  // do something with i
  products[i].addToCart();
}
 
var intervalId = setInterval(function () {
  // check
  if (checkOnExternalConditions(i)) {
    // call the function
    mainFunction(i);
    // go to next iteration
    i += 1;
  }
  
  if (i === products.length) {
    // the loop ends when all the products have been checked
    // any other operation that should run at the end of the loop should be placed here
    clearInterval(intervalId);
  }
}, 100);