I typically get a couple dozen technical books for each non technical. I purchased via Amazon “Deep Work” by Cal Newport. I saw it mention while reading an article in Medium. It took me less than a week to read the book. The subject is very well known to me. Will explain why it is the case in the following paragraphs.
I was born in Lima, Peru. My parents left Europe in the 1930s in search of a better life. I had three siblings. One of the twins graduated from college as an international attorney and passed away months after. My other two sisters are physicians. One continued her studies in the USA and Europe. Today she is a professor at an Ivy League school spending time in a lab in China at a well know university. I came to this country over 40 years ago with a scholarship to attend an Ivy League school in New York.
I believe it was Albert Einstein who said “Any man who reads too much and uses his own brain too little falls into lazy habits of thinking”. I like to read in order to learn about different subjects, mostly associated with computer science and technology. I also like to experiment with what I am reading in order to verify that I understand the material. 
This past winter was quite long but not too cold. A few weeks ago we received a one two punch with two winter storms. After that the temperatures went up and we had a day with temperatures in the mid 80s. In the past week the temperatures were down. Last night we were in the lower 40s. We turned off the central heating system at home for the season. We have already been using the air conditioner for a few days. This morning the inside temperature upstairs was 66 F. My home office is downstairs. The temperature has been at a solid 60 F so far. My wife and I are planning on going for a walk in a couple hours. 
In my previous post I mentioned that I was going to be spending some time experimenting with MongoDB. So why would I be dealing with MySQL at this time? Good question! The reason for it is that I want to store, among different things, Java objects in MongoDB. I am interested in comparing how the same Java object may be stored and retrieved using a SQL and a NoSQL databases. I could have used a different SQL database (e.g., SQL Server), but decided on MySQL. It happens that I have a few databases installed on my Windows 10 computer. With that out of the way; let’s experiment with MySQL. 
As mentioned in a previous post, I will be spending some time learning, experimenting and working with the MongoDB NoSQL database.
Earlier this week I ran into a description of 
Code complexity is a subject that is taught early on in Computer Science curricula. Not sure if early is the reason why many software developers tend to forget what it is and how to apply it.
Most software developers now a day write code using object oriented (OO) programming languages. In some cases, due to performance reasons, some code may be written using a non OO language. One way or the other, the question may come up if return codes are better than using exceptions. I do not believe you can come with enough reasons to justify one method or the other which would be accepted by most software developers. What I will do is discuss some considerations and give my opinion. Please take it all with a grain of salt. 
A few days ago a group of software engineers were discussing how the order in which the numbers of rows versus columns in a two dimensional array affect performance. That is; if an array has more rows than columns as opposed to more columns than rows, the time it takes to traverse the array will be affected.