retry a Request repeatedly until it succeeds or the try limit is reached

insistent request using generators.js

function insistentRequest(request, tryLimit){
  if(!tryLimit) return Promise.reject('tryLimit must be above 0');
  let tries = 0;

  return new Promise(function(resolve, reject){
    //create a generator object that repeatedly 'yields' the same promise until it succeeds or the try limit is reached
    const genObj = function* gen(){
      while(1){
        yield request()
          .then(resolve)
          .catch(e => {
            tries ++;
            if(tries === tryLimit) return reject(e);
            else return genObj.next();
          });
      }
    }();
    genObj.next();
  });
}

//example
insistentRequest(() => load('blah.jpg'), 4)
.then(response => ...)