| API | description |
|---|---|
| JSON Placeholder | mock REST APIs for development only |
| Google Translate | generate free translations up to a certain limit |
| Open Weather Map | weather prediction across the world |
| REST Countries | info about the world’s countries |
| IP API | data about IP addresses |
| Random Data API | like the first one, but with a sharper focus on random data |
| Pokemon API | info about Pokemon with recent introduction of GraphQL API |
Sekai ๐ ๐บ
Sekai (ไธ็) is the kanji for “the world”. That’s a great word because of the scale that it designates.
Merge Two PDF to Single Encrypted PDF
Problem I have unprotected
input1.pdf input2.pdf and I want to create one single encrypted.pdf.
My try I looked up QPDF’s manual and tried the following command.
qpdf --empty --pages input{1,2}.pdf --encrypt upw opw 256 -- encrypted.pdf but I got this error.
qpdf: unrecognized argument --encrypt (pages options must be terminated with --) For help: qpdf --help=usage usage information qpdf --help=topic help on a topic qpdf --help=--option help on an option qpdf --help general help and a topic list Solution The sentence inside the parentheses says it all.
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How to Start an Online Empire Without a Job
A quick way to begin your online empire
Difficulty To start an online empire from zero is not something that can be done easily. One lacks the connection with experienced netizens who might know the inside secrets.
Solution You may start your empire on Forge of Empires. You’ll be guided by a beginner-friendly tutorial. The daily tasks are easy and they will only take you a few minutes, but they are rewarding. You’ll end up earning thousands of coins on the website.
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Ten Probably Handy Sites
A brief summary of 10 Incredibly Useful Websites on Medium.
Upword.AI (paid) summarise stuff Gamma (free trial for the moment) get professional slides in min, not open source IMGCreator (free, point-based) text/img โ img, chatGPT powered Popsy (free to create, paid to publish) no-code website buider Visual Capitalist (free) explanatory charts TypeLit.io (free for some ลuvres, paid for own book) type classics out to train typing Zorp.one (free for trial, paid for deploy) no-code app generator for businesses, e.
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Encrypt PDF on Command Line
Background On M$ Win*, I don’t have dedicated PDF readers like Adobe.
During visioconference, one might want to share some downloaded PDFs. Those documents can be part of an ebook or notes. In some situations, they can provide context to a discussion.
Problem Under the same folder, you might have downloaded_ebook.pdf personal_info.pdf other_personal_stuff.pdf that you don’t want to expose while streaming. However, each downloaded PDF usually comes with a name set by others.
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Adjust Git Bash Font and Window Size
Goal
Make the characters larger and more readable.
Solution
The option names might be found in the manual. Sometimes, I find opening MINGW’s settings through GUI helpful.
FontHeight=12
Columns=143
Rows=36
I’ve read Gerald Lee’s .minttyrc. I’ve enlarged the window size so
that in the standard output, one line can contain more info.
Fujitsu LH532 Thermal Paste Application
Background My old laptop was bought ten years ago. I had never changed the thermal paste between its CPU and its fan. As a result, it had been getting hot during my online tutorials.
Photos thermal paste on CPU displaced after ten years thermal paste on fan displaced after ten years dried thermal paste cleaned and removed with isopropyl and kitchen towel
I had to look at a previous article written five years ago to confirm the part that I wanted to disconnect.
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Removed jQuery Dependency from My Math Editor
Background jQuery provides many handy functions to speed up the development, for example document.ready(), element.toggle(), element.hide(), etc. My math editor used some of them. However, I replaced them with Vanilla JavaScript at commit 4a35c45b.
Goal Some users complained about the white background in the past versions of my editor. That had motivated me to refactor the code, so that it would be easier to maintain and to add in new features.
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Showdown KaTeX With mhchem
mhchem support for Showdown-KaTeX
Background I’ve written about bringing user-defined KaTeX macros into Hugo a few years ago. Looking back, I realized that I only knew how to copy code at that time.
Goal To replace the current code for my math editor with Showdown-KaTeX. To bring mhchem into my LaTeX + Markdown sandbox. Motivation To get the benefits of the three free (as in “freedom”) technologies.
Markdown syntax is (much) simple(r than its LaTeX equivalent, especially for tables, ordered/unordered lists, etc).
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Exponential Function Product Rule
A first definition of exponential and logarithmic functions
Motivation from compound interest Increase the number of times that the interest is compounded each year ($n$), so as to increase the final amount of money ($A$)
$$A = P \left(1 + \frac{r}{n}\right)^{nt}.$$ $t$ and $r$ are the number of years and the interest rate per annum.
As $n$ becomes large, we can approximate the amount by
$$A = P e^{rt}.$$ The value of $A$ in the above formula is the amount compounded continuously.
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