A frequency map is just a fancy word for a hash map that tracks the number of occurrences of an element in a collection. If we have a slice in Go and we want to know exactly how many times each element in the slice occurs in the slice, we can build a frequency map… Continue reading Frequency map in Go
Map-as-Set in Go
In programming languages like Go, there is no built-in type for set. A set essentially answers yes or no: is a given element present? We can use the built-in map type to implement sets. I used to implement map-as-set like this: Apparently, Gemini thinks there’s a better way: Gemini thinks this is better because it… Continue reading Map-as-Set in Go
KompacPlus
KompacPlus is marketed as a counter top material, and sometimes wall material. The sellers often claim it’s comparable to quartz and sintered stone. KompacPlus is made in Italy, but only sold in Singapore and Malaysia. It’s essentially “made from layers of resin-soaked kraft paper” and compressed with extremely high heat and pressure. It’s non-porous, somewhat… Continue reading KompacPlus
Let’s Encrypt! certificate always expires
I usually don’t SSH into the server that runs this blog. When I do, it’s because the free SSL certificate by Let’s Encrypt! has expired. Every time this happens, I just google to find a quick solution, and I’ll quickly forget the steps within days. So this time, I’m going to write the steps down.… Continue reading Let’s Encrypt! certificate always expires
Interface implementation in Go is implicit
I’m quite familiar with the concept of interface in Java; but on my first day reading my colleague’s Go code, I was a little confused. Here’s how: In Java, implementing an interface is explicitly declared with the keyword implements, followed by the names of the interfaces being implemented. For example: By looking at the class… Continue reading Interface implementation in Go is implicit
Best MySQL data types for storing date & time
When it comes to storing date/time in MySQL, several data types are commonly used. My colleagues and I had a brief discussion today on which type we should use for storing created and last updated date/time. Folks were divided into two camps. Those who preferred to work directly with UNIX timestamp wanted bigint, while people… Continue reading Best MySQL data types for storing date & time