Recursive Random Time Function Cxecution with JavaScript ES6 Generators

example.js

function* gen(){
  var rand = _.random(1000,5000);
  return ()=>{
    return setTimeout(()=>{
      console.log('hi');
      console.log(rand);
      return gen().next().value();
    }, rand)
  }
}

var x = gen();
var y = x.next();

console.log(y.value());

//outputs
//"hi" every random time interval between 1s and 5s