Xah Programing Blog 2019-07

todo fix golang replace.go printing the find/replace pairs.

golang's type and lowness

golang's type and lowness is starting to get me. whenever you need a list of element that's tuple of diff types, you need to create a type, namely struct.

Golang Tutorial learn Golang in 1 hour

Jaron Lanier on Open Source

Python 3 Adoption python image lib still no support py3. updated

Combinatorial Unicode Chars

another combinatorial unicode char set is the trigram. Note that, in these MONOGRAM, TRIGRAM, TETRAGRAM, HEXAGRAM, some allows the bar to break into 3 pieces, while other only 2.

unicode trigram hexagram 2019-09-10 zgxs2
unicode trigram hexagram 2019-09-10

Unicode Cultural Religious Symbols ☭

ways to order combinatorial patterns

one interesting thing is how do you sort braille? here's 3 possible ways.

sorting braille 2019-09-10 zwtdy
sorting braille 2019-09-10

Unicode Braille ⠮

unicode braille converter 2019-09-09 tpzkw
Unicode Braille ⠮

Isopsephy puzzle

a=1, b=2, c=3 etc. love = 12+15+22+5=54. find another word that's 54.

Isopsephy 2019-09-09 3shcr
Isopsephy 2019-09-09
invert text 2019-08-28 y4yvm
Unicode Invert Text Ɐ

math languages, scientific programing, a new kind of science, what is random, cellular automata 2019-08-28

great read.

[A Book from Alan Turing… and a Mysterious Piece of Paper By Stephen Wolfram. At https://blog.stephenwolfram.com/2019/08/a-book-from-alan-turing-and-a-mysterious-piece-of-paper/ ]

the story of Ò Ó Ô Õ Ö Ō Ŏ Ő Ɵ Ơ Ǒ Ȍ Ȏ Ȫ Ȭ Ȯ Ȱ Ǫ Ǭ Ø Ǿ Ṍ Ṏ Ṑ Ṓ Ọ Ỏ Ố Ồ Ổ Ỗ Ộ Ớ Ờ Ở Ỡ Ợ

Unicode Latin

Facebook Embedding Tracking Data Inside Photos You Download

Unicode IPA æ

bitcoin ₿ key is 34 chars. is there a standard where to split? like every 5 chars or 10?

Why is Array Access Constant Time updated

Unicode: Greek Alphabet α β γ updated.

Deseret Alphabet 𐐃

Xah Talk Show schedule

ok, finally i have a schedule. Thx to BartholomewJS's incessant prompts. 😇

All time is San Francisco time.

topic is undecided. But basically the subject is going to be any of:

go YouTube xahlee sub + 🔔

Shavian Alphabet 𐑕

math font converter

unicode math font convert 2019-08-15 hw66m
Math Font ℤ

lol, this thread. [ twitter FakeUnicode ] [ 2019-08-14 https://twitter.com/FakeUnicode/status/1029861801507213312 ]

but am thinking, perhaps it's the other way round. 𝔰𝔬𝔣𝔱𝔴𝔞𝔯𝔢 𝔰𝔥𝔬𝔲𝔩𝔡 𝔰𝔲𝔭𝔭𝔬𝔯𝔱 𝔲𝔫𝔦𝔠𝔬𝔡𝔢 𝔪𝔞𝔱𝔥 𝔣𝔬𝔫𝔱. and it's a matter of time.

things evolve. once the 𝔲𝔫𝔦𝔠𝔬𝔡𝔢 𝔪𝔞𝔱𝔥 𝔣𝔬𝔫𝔱 𝔠𝔥𝔞𝔯𝔰 is out of the door, people use it however they like, just like 🤷. Even mathematicians, few would know the difference of ∆ Δ ∂ δ ∑ Σ µ μ.

gitorious.org cert expired. probably a ghost town by now.

Helicopter Rotor

Chinese Prosperity Symbols

🉠 luck 🉡 prosperity 🉢 longevity 🉣 happiness 🉤 marriage 🉥 wealth

added to Unicode Cultural Religious Symbols ☭

Christian Feast Symbols

there is these: 🕃 🕄 , meaning Orthodox typicon symbol for lower rank feast.

also 🕀 🕁 🕂. Apparently, there's Orthodox Church, and has ranking of feasts.

and there is 🕅, meaning Orthodox typicon symbol for difficult sections. Apparently used for bible reading or something.

added to Unicode Cultural Religious Symbols ☭

Om Symbol, in Hinduism and Buddhism

🕉 OM SYMBOL. Meaning Almighty God in Hinduism. See also: Unicode Devanagari अ

and here's a 🕉 Om chant song 六字真言頌 six-syllabled Sanskrit mantra “Om mani padme hum”

here's om in tamil: Unicode Tamil அ

perl6 unicode operators

perl6 unicode 2019-08-09 79fkn
perl6 unicode [source docs.perl6.org]

See also: Unicode in Function Name and Operator

Python Syntax Soup: x in y

Homotopy Type Theory

that guy, Vladimir Voevodsky, i think spend only few years and invented homotopy type theory. So i think one have a chance getting acquainted with the whole logic/proof/foundation if reading say 2 hours for 4 years. Much thanks to @johncarlosbaez for showing me much math.


added to Unicode Arabic ش

note the word bismillah is in the lyrics of Bohemian Rhapsody Queen ♪ Bohemian Rhapsody

Category Theorists, Do You Speak Formal Logic?

my complaint about category theory: On wikipedia, even graduate level math subjects, are well written with formal definition given. If i persist, i can see myself understand it after days. Not so with category theory.

e.g. Wikipedia category theory page doesn't give proper definition (maybe it's there, but typically hard to tell). Then, category books tend to talk chapters after chapter informally and drag in lots of wishy washy analogies. i lost patience.

XahTV 2019-08-01 programing languages and their culture. perl python ruby

JavaScript, why there's no "use js2015" pragma to clean up the language?

Binary/Hexadecimal Converter (added a tutorial)

camelCase vs snake_case (updated)

See also: Computer Languages Characters Frequency

Can Lisp Macro Change Lisp Syntax?

Perl Books Survey 2002 (updating some dead links)

Scripting: Higher Level Programming for the 21st Century

programing language where you can copy paste any function anywhere

i really want a language where you can copy paste any function definition in any project and use in another project. doesn't seem to exist. For this to work, the function param must encode any dependency, of global var and libs.

for text processing, golang code is 1.5 or 2 times longer than python

for text processing, golang code is 1.5 or 2 times longer than python. python is about 1.5 times longer than emacs lisp.

elisp is shorter due to elisp designed for text processing. no need to deal with bytes, encoding, opening file, file handle, etc, even backup is just turn on a var. and one has cursor position, buffer etc.

python is shorter than golang due to golang is lower level, and typed. much more declaration, handling low level stuff, byte/string conversion, and notorious golang error checking problem.

See also: Text Processing: Emacs Lisp vs Perl

Unix Pipe as Functional Language (minor update)

JavaScript/DOM String Hell and Symbolic Languages (updated)

LISP, What Does Symbolic Language Mean? (Finished update.)

gnu head heckert gnu
Free Software, Communism, Ideologies, Policies

video of Daniel Friedman. programing language researcher

https://vimeo.com/161794995 that's Daniel Friedman, one of the few experts on programing language design. haven't seen him before. #lisp #scheme

programing lang design is mostly a community of amateurs. Because, it has relatively little practical value and little theoretical value, in contrast to actual coding or math.

Xah Talk 2019-07-19 lisp syntax, sexp, meta-expression, Mathematica, meaning of sugar syntax

racket2 lisp ditching parenthesis

nested heterogenus data in typed lang. Or, important json data to golang.

run into a problem with golang, or typed lang in general. In json, or python ruby perl JavaScript, you can have arbitrary nested map/array. In golang, you can't due to types. you have to declare or create the structure before hand. How's this done? going to look into.

@kerukeion right. but the issue to me seems to be the declaration part. e.g. i was coding a script, in python etc i'd just code the nesting. But in go, seems i need to first think about, design, then declare, the structure first. am now wondering, when importing json, what does go json lib do? gonna look into.

began to read #golang json lib https://golang.org/pkg/encoding/json/ incomprehensible. In python you just python_obj = json.loads(str) in JavaScript you just js_obj = JSON.parse(str) This is interesting issue about typed lang importing structure from dynamic lang.

todo. read about unicode 12

golang tried to have a try

golang tried to have a try [2019-07-17 https://github.com/golang/go/issues/32437 ]

if golang start to have a try or even the jargon “exception”, i'll stop using golang. i'd rather type if err != nil { panic(err) } every 10 lines.

todo. to read. [2019-07-17 https://github.com/golang/go/wiki/SliceTricks ]


[ twitter xah_lee ] [ 2019-07-17 https://twitter.com/xah_lee/status/1149475035733565440 ]


Proliferation of Programing Languages updated.

in APL, A ⍟ B means Logarithm of B to base A. I think APL's symbolic operators rather idiotic.

APL Symbols Meaning and Code Example

todo. question for haskell coders. Say I need to gen a list of file paths, 50k of them. I can var global mylist; and f(root) to populate it. But if f is pure function we do mylist = f(root), it double memory requirement. How does pure func lang code this?

todo move conicsEtynomogy.txt

Unicode Symbol Become Emoji

Problem of Declarative Animation

Egyptian Hieroglyph 2019-07-05 b4rp3
Egyptian Hieroglyph 𓂀

youtube-dl --update, be careful!

when you use youtube-dl --update you have to be careful. because who knows if author changed or got brought out.

haskell making invalid state not representable by type

gabriel gonzalez error message 2019-07-01 h8nq3
gabriel gonzalez on error message 2019-07-01 [2019-07-03 https://twitter.com/GabrielG439/status/1145355462537166849 ]