Class 8

Callback hell is when you try to execute multiple asynchronous operations one after the other. The way to avoid it is by using promises

Dummy objects for testing

Streams are a way to handle reading/writing files, network communications, or any kind of end-to-end information exchange in an efficient way.

Chaining async functions, can be in parallel or serial

The console module provides a simple debugging console that is similar to the JavaScript console mechanism provided by web browsers.

process.exit(1): Uncaught Fatal Exception,

process.exit(5): Fatal error

A Clustered index is a type of index in which table records are physically reordered to match the index. A Non-Clustered index is a type of index in which logical order of index does not match physical stored order of the rows on disk.

The 4 types of user-defined functions are:

-Function with no arguments and no return value

-Function with no arguments and a return value

-Function with arguments and no return value

-Function with arguments and a return value

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