Your Coding Teacher

If you pass a boolean to a function, there might be an if statement somewhere Why not refactor that function into two functions and call the appropriate one?

"A man provided with paper, pencil, and rubber, and subject to strict discipline, is in effect a universal machine" - Alan Turing

Some properties of distibuted systems: - Reliability: the system can tolerate faults (software or hardware) - Scalability: the system has good performance when load increases - Maintainability: the system is easy to extend and to operate

Some questions to consider to clarify requirements: - Read/write heavy sistem? (or both) - Expected # Users (average and peak) - Traffic patterns - Amount of data to store (for how long) - SLA - Consistency model? - Cost of development vs operations/maintenance

Perl was developed by Larry Wald in 1987 as a scripting language for text editing It is commonly used in: - Linux system administration - Web development - Network programming print "Hello, World!\n";

I've also wasted long hours debugging issues that came from: - Reading the wrong configuration file - Using outdated information from an internal wiki page - Problems with someone else's code - Copy-paste related errors When things go wrong, check your assumptions.

Bit-level operations on an integer x x |= 1<<7 -> set bit 7 (the first bit starts at index 0) x &= ~(1<<7) -> clear bit 7 x ^= 1<<7 -> toggle bit 7 mask = ((1<<8)-1) -> create an 8 bit mask (x >> 16) & 0xf -> extract bits 16 through 8 (x >> 7) & 1 -> test bit 7

We live in a world governed by distributed systems. From small intranets, to share printers, to the Internet

4 JavaScript interview questions What is a Callback function? What are Arrow functions? What is the usage of Function.prototype.bind? How to check if a value is null?

Make something fool-proof and someone will make a better fool

Instead of trying to figure out what's the next incremental improvements for a slow algorithm, sometimes it's better to try a complete different approach

"The language in which we express our ideas has a strong influence on our thought processes." - Donald Knuth

The best thing about a boolean is even if you are wrong, you are only off by a bit

"There are no significant bugs in our released software that any significant number of users want fixed." - Bill Gates

The best developers follow a simple principle "Always Be Learning"

In GCP, you can use preemptible virtual machines to save up to 80% of your costs. They are ideal for fault-tolerant, non-critical applications. You can save the progress of your job in a persistent disk using a shut-down script to continue where you left off.

Message queues in a tweet - Allows for asych processing - Stores messages that servers will read and process - Adds reliability (no message is lost) - Dead-letter queue: receives messages that couldn't be routed to their destination - Ex: SQS, Kafka, Rabbit MQ, Pub/Sub

Python's list comprehensions provides a concise way of creating a list from another. For example: cubes = [x**3 for x in a]. In general, they are clearer than maps and filters built-in function.

"Debugging is like being the detective in a crime movie where you are also the murderer." - Filipe Fortes

//TODO comments end up being //Never do's