Your Coding Teacher

3 main replication methods a Single-leader - Write to leader which replicates them to the rest - Read from any node b Multi-leader c Leaderless: Quorum from nodes for reads (k nodes return same values) & writes (k nodes ack the write) Simplicity vs robustness

"It makes no sense to try to do what we can. We must do what is necessary." - Winston Churchill

"Sometimes it is the people no one can imagine anything of who do the things no one can imagine." - Alan Turing

If there's a QA team in your company, set yourself the goal that they will not find any issues in your code.

JavaScript was developed by Brendan Eich in 1995 Javascript is often just-in-time compiled and is considered a core technology along HTML and CSS for web development. Javascript can be used both for front and backend development console.log("Hello World");

"Computer science education cannot make anybody an expert programmer any more than studying brushes and pigment can make somebody an expert painter." - Eric Raymond

Python tip: Instead of -> if not a is b: Prefer -> if a is not b: Easier to read and understand.

Does your definition of done include writing automated tests, at different levels, for both technical and non-technical requirements?

Basic regex matches: - ^ -> beginning of string - $ -> end of string - \d -> digit - \D -> non-digit - x? -> optional - x* -> x any number of times - x+ -> x 1 or more times - x{n,m} -> x from n to m times - (a|b|c) -> either a, b or c

Basics of most programming languages * Variables * Data types * Conditionals (if - else) * Loops (for - while) * Functions * Arrays * Dictionaries * Classes and objects That's enough to build many interesting applications

A delayed write goes to disk after spending some time in a buffer: to improve efficiency, instead of sending every write operation directly to disk, data is put into a buffer and queued for writing to disk later. System calls like fsync are used to write directly to disk.

Explicit is better than implicit - The Zen of Python

Scripts (like tests) are part of your system. You need to version-controll, maintain, test, and refactor them. They will make you go fast in the mid/long term.

Decipher the classic Java public static void main(String args[]) - public: anyone can call this method - static: function belongs to class, not to a particular instance - void: return type - main: function name - String: argument type - args[]: array of strings

Have pride in solving problems Not in writing code

If you want to confuse your enemies, give them the source code. If you want to really confuse them, give them the documentation.

"Most people find the concept of programming obvious, but the doing impossible." - Alan J. Perlis

Test doubles lingo - "Fake" implementation of real services (eg: in-memory db) - "Stubs" return certain values when invoked - "Mocks" keep track of interactions (eg: number of invocations) - "Spies" verify interactions with and/or mock some parts of a dependency

Amazon EC2 - Provides virtual servers - Supports multiple OS - Resources optimized for different workloads: memory/CPU intensive, storage, etc

I don’t see why developers make six figures, all they need to know is: - Linux - Bash - Go - Python - JavaScript and frameworks - Git - Docker - Kubernetes - Terraform - Distributed Systems - AWS - GCP - Prometheus - Grafana - Being On-call - Security