@rkenmi - Home

Math Formulas for C.S.

Sum of the first \(n\) integers \(1 + 2 + 3 + ... + n = \) $$\sum_{k=1}^n k = \frac{1}{2}n(n+1)$$ Use cases: Finding a missing number from \(1 ... n\) Sum of the squares of the first \(n\) integers \(1^2 + 2^2 + 3^2 + .

Computer Sciencewikimathformula

AWS Lambda and other Maven projects

Background AWS Lambda is a FaaS (Function as a service) that is event-driven and serverless. It is termed event-driven due to how AWS Lambda functions are invoked - the event that triggers a AWS Lambda function can be of many different types in the AWS realm.

JavaAWSMavenFaaScloud computingdev opsAWS LambdaAWS SAM

Spring - Basic Concept

Spring has an object called the "Bean Factory". This factory creates new objects, or rather, new Beans for us, without the need of instantiating via the new keyword. The factory reads off of a Spring configuration file, which can either be a XML file stored locally, or a class annotated with @Configuration at compile-time.

SpringSpring Beans

Basic Encryption

There are two types of encryptions: symmetric and asymmetric. In a symmetric encryption, one secret key is generated, and that very same key is shared between the sender and receiver. Databases benefit from using symmetric encryptions, as they are much faster to use as opposed to the asymmetric alternative.

encryptionaesrsadsasymmetric encryptionasymmetric encryption

Google Protocol Buffers

From Wikipedia: Protocol Buffers are a method of serializing structured data. It is useful in developing programs to communicate with each other over a wire or for storing data. Here are some key characteristics of protobuf: Serialization into bytecode means that data is condensed -- small in size.