Asynchronous Javascript

1. asynchronous and synchronous code 
2. How asynchronouse code exectued 
3. what is the excution thread 
4. Ajax 
5. promises Object methods 
6. static and instance Promises methods 
7. How response.json() methods work 

Promise Static methods :-

• the method that will be call * access directly via class Reference

1. Promise.all(): it takes  array of the Promises , if one fail then result rejected 
2. Promise.allSettled(): No matter this return the value of  the promise either resolve or reject 
3. Promise.any():  This return only fulfilled Promise order no preserve 
4. Promise.race():
5. Promise.reject(): 
6. Promise.resolve(): 
7. Promise.try() 
8. Promise.resolvers()