exponentialBackoff function

readme.md

A function that keeps trying, "fn" until it returns true or has tried "max" number of times. First retry has a delay of "delay". "callback" is called upon success.

index.js

exponentialBackoff(fnFailsSomeTimes, 10, 100, function(result) {
  console.log("the result is", result);
});

function exponentialBackoff(fn, max, delay, callback) {
  const result = fn();
  if (result) {
    callback(result);
  } else {
    if (max > 0) {
      setTimeout(function() {
        exponentialBackoff(fn, --max, delay * 2, callback);
      }, delay);
    } else {
      console.log("Retry count exceeded. Stopping calls");
    }
  }
};