Small-talk was developed in 1972 by Alan Kay, Adelle Goldberg and Dan Ingalls at Xerox Smalltalk was the first language to popularize object-oriented programming (Simula 67 was the first language to introduce OOP concepts). 'Hello World!' printNl !

Design patterns in 1 tweet Builder. Separates object creation from its representation Ex: Have the flexibility to build them like this (Java) Meal m = new MealBuilder.setMainCourse(mainCourse).setDrink(drink).setX()... .build(); Instead of a cascade of constructors

IAM in GCP & AWS: - Service account~IAM role & instance profile - User identity: managed outside VS inside IAM - Policy: list of bindings (members to a role) VS list of permissions in JSON - (Predefined) Set of permissions: (Predefined) Role ~ (Managed) Policy

Google Cloud encrypts data both: - At rest (data stored on disk) and - In transit (data traveling in the network) using AES implemented via Boring SSL.

C Program to count elements. Can you find the bug? for (i=0; i<numRows; i++) for (j=0; j<numCols; j++); numElements++;

"In man-machine symbiosis, it is man who must adjust. The machines can't." - Alan J. Perlis

"Your obligation is that of active participation. You should not act as knowledge-absorbing sponges, but as whetstones on which we can all sharpen our wits" - Edsger W. Dijkstra

Design patterns in 1 tweet Adapter: Match interfaces of different classes Ex: a charger that can connect to a power plug in India (interface 1) will need a power adapter to connect to power plugs in the UK (interface 2). The charger (class) does not need to modification

🚨During 𝙩𝙝𝙞𝙨 𝙬𝙚𝙚𝙠 𝙤𝙣𝙡𝙮 I have some time again for 30 min or 1 hour mentor calls🚨 You'll progress faster with: - Programming - Interview preparation - Algorithms & Data Structures - DevOps - Your career Or any topic you want to get personalized advice DM me

Design patterns in 1 tweet Chain of responsabily: Pass a request through a chain of objects Ex: Exception handling in Java. If method X can't handle an exception, it will pass it up the chain to the method that called method X

2 ways options to define startup scripts in GCP: - When you are creating your instance in the Google Console, there is a field to paste your code - Using the metadata server URL to point to a script stored in GCS This latter is preferred.

Document and graph databases don't enforce a schema But applications usually assume some structure, which brings the question: If schemas are defined explicitly (when writing) or implicitly (when retrieving data) Are they really "Schema-less"?

Thinking you can learn coding/data science by watching someone else do it in a tutorial Is like thinking you will get abs by watching someone else work out.

Design patterns in 1 tweet Facade: abstract complex operations behind a simple interface Ex: when you buy something at Amazon, you see an interface that hides all the complexity behind it: warehouses, deliveries, payments, suppliers, etc.

CAP theorem Out of these 3: - Consistency: reads the most recent writes - Availability: all request receive response - Partition tolerance: ~ network failures YOu can only pick 2. Network failures are guaranteed, so it boils down to: Consistency or availability?

Som important root subdirectories in a tweet - /bin: stores executables (cp, ls) - /dev: device files - /etc: stores core system configuration - /home: your personal directory - /lib: libraries - /opt: 3rd-party programs - /proc: has info about running processes

"Measuring programming progress by lines of code is like measuring aircraft building progress by weight." - Bill Gates

Python list traversing tip Instead of this: for i in range(len(l)): x = l[i] Use this for i, x in enumerate(l): ... TO keep track of indices and values inside a loop.

Nobody expects you to know everything.