Test Yourself: Asynchronous Programming

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Some things you should know before moving on.

What is a call stack?
What is the main reason for a call stack?
What is a stack?
What is a queue?
How do stacks and queues relate to the call stack?
How does a call stack relate to Node's event loop?
What is the V8 engine? What language is it written in?
What is libuv? What language is it written in?
How does the Chrome V8 engine work?
How do the V8 engine, libuv, the event loop and OS work together to create asynchrony in Node.js?

What native module is used to perform file operations in Node.js?
What are three common operations the fs library performs?
How many versions of each method are there in the fs module? Why?
What is the difference in execution flow for the different versions of these methods?
What is meant by "error first callbacks"?

What are promises?
What is meant by "a promise is a proxy for an unknown value"?
What problems do promises exist to solve?
How many possible states are there for a promise to have and what are they?
Once a promise has resolved, can it be rejected? Why?
What do you pass to a promise constructor created with new?
What parameters does the callback function to a promise constructor take?
What method is chained on a promise to gain access to its value?
What are two ways that you can gain access to the rejection value or error message of a promise?
How is catch different from the rejection callback of a then call?
How can you resolve multiple promises at once?