Software Engineering

Use nested objects for future extensibility

A follow on from the previous tip: try to logically group fields together. The following:

customer.address = {

line1: "Main Street 123",

city: "San Francisco",

postal_code: "12345"

};

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is much cleaner than:

customer.address_line1 = "Main street 123";

customer.address_city... See more

When a test fails, you should be able to begin investigation with nothing more than the test’s name and its failure messages —no need to add more information and rerun the test.

Effective use of unit test frameworks and assertion libraries (JUnit, Truth, pytest, GoogleTest, etc.) serves two important purposes. Firstly, the more precisely we express... See more

How to build this skill:

• Maximize what you can do on your own: by ruthlessly prioritizing your time, pushing back on activities that have small ROI, and focusing on areas where your input is crucial; for engineers, it often means less coding (if more junior people can do that piece of coding).


• How you can maximize what you can do through others:

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The book Clean Code introduces three laws of TDD [1]:

1. Write a failing unit test first before you start writing production code.


2. Write not more of a unit test than is sufficient to fail.


3. Write not more production code than is sufficient to pass the currently failing test.

So, the tests are written before the production code. This leads to the developer... See more

Coz: Finding Code that Counts with Causal Profiling

by Charlie Curtsinger and Emery Berger

Coz is a profiler for native code (C/C++/Rust) that unlocks optimization opportunities missed by traditional profilers. Coz employs a novel technique called causal profiling that measures optimization potential. It predicts what the impact of optimizing code... See more

Here's a list of those log levels from lowest precedence to highest:

notset (0) - Indicates that ancestor loggers should be consulted for the log level or that all events are logged (default setting)

debug (10) - Detailed information that would be of interest to the developer for diagnostic purposes

info (20) - Information that confirms that your... See more

Your job involves turning the unknown into the known and translating vague ideas into actionable plans. This often involves a blend of:

• Detective work — ask the right questions, collect evidence, build a case theory, validate it


• Isolating uncertainty to the smallest components and proving / disproving theories


• Divide and conquer — breaking down the

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Whenever you write a log, it’s important you choose the correct log level.

I personally mostly use ERROR, WARNING, INFO, or DEBUG (yes there are a few more).

Log levels TLDR

• ERROR: Parts of the flow failed, we want to send alerts to our on-call for this failures.


• WARNING: Doesn’t necessarily point to a failure, but an unexpected behavior that should

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• Tornado is a Python web framework and asynchronous networking library designed for handling long-lived network connections. It is built to be non-blocking and uses an event loop to manage all operations. While Tornado itself does not rely on a thread pool for its core operations, it provides interfaces for integrating with thread pools (e.g.,

... See more