TIL: null is an object in Javascript

I’ve been in a lull about learning concepts related to programming and web development the past few months so yesterday when I got an email about Just Javascript, I signed up for the course to check out how it will be.

So far, I’m running into pleasant surprises like how there are only nine data types in Javascript.

  1. Numbers (1, 3.14, -500)
  2. Strings (“hello”, ‘samson’, ‘a long sentence’)
  3. Booleans (true and false)
  4. Undefined (undefined)
  5. Null (null)
  6. BigInts (not sure about these yet)
  7. Objects ({})
  8. Functions (sum => x + x)
  9. Symbols (uncommon but used for referring to unchanging values)

Well, after learning about these, I also ran into an interesting quiz question in the course, what is the value of null when checking with typeof()? Turns out it’s "object". This was a surprise to me but I guess it’s been a bug for a long time.

Here’s a lot more info about it from someone who knows JS way better than me:

The history of “typeof null”.

TIL: polling rates for keyboards

I was setting up my GMMK Pro keyboard over the weekend and I ran into an interesting feature in the Glorious Core software, “polling rate” which is the first time I’ve seen this feature.

I went looking around and from reddit I got linked to this Geekhack thread: Keyboard polling rate

Simply put, the keyboard’s polling rate is at what frequency the computer checks for input from the keyboard. Since this keyboard is meant for gaming, it of course comes with the ability to change it from 125hz to 1000hz.

1000hz refers to every 1 milliseconds.

125hz refers to every 8 milliseconds.

TIL: using my own blog as a knowledge DB with Google as the search engine

Today, I saw Simon Willison’s “One year of TILs” post on HN (which itself was inspired by Josh Branchaud’s collection) where he mentions writing blog posts that come from small tidbits of knowledge. For a long time, I’ve dabbled in keeping notes in Notion, text files edited with vim, and a bunch of native mac apps but the problem I run into over and over is the inability to deeply search for things. Notion has been improving in this regard but still feels really slow. This is a surprise since it has all of data that I want to search.

Well, I realized that if I wanted to just search through my blog posts and pages on my blog (where I keep most of my public notes), I can just use google with the site:usmanity.com specifier.

Why not DuckDuckGo?

I use DDG for 99% of my searching on my phone and computers so when I tried the site:usmanity.com or even the one where it was specifically my blog (site:blog.usmanity.com), DDG fails to find any of the specific pages/posts. So I went with Google on this one.

How it works

To speed up the whole process, I’ve made a custom search for Alfred, this is the key to making this trick work.


In the above image, the “b” stands for “search on my blog” and the rest is what gets passed to Google. It works like a charm. I get a few search results and the more specific I make the search, the less results I get which is perfect for my use case!

This might be my first TIL post as well 😀