Hello cruel world

It is traditional, when tinkering with a new blogging tool that you just made and will almost certainly abandon within a week, to write a “hello world” style post that serves as a quick check that the tool is working. This tradition almost certainly developed because nobody bothers to write unit tests for code that isn’t supposed to be used in the wild. This blog is no exception.

Markdown

Lists

Unnumbered lists, with nesting.

• blah blah blah
  • blah blah
  • blah
• blah blah blah
• blah blah

Numbered lists, also with nesting.

1. blah blah blah
   1. blah blah
   2. blah
2. blah blah blah
3. blah blah

Font

Markdown syntax for italics is supported, as is boldface, and strikethrough.

Tables

State	Code	Capital	Population
New South Wales	NSW	Sydney	8,484,357
Victoria	VIC	Melbourne	6,981,352
Queensland	QLD	Brisbane	5,586,322
Western Australia	WA	Perth	2,965,159
South Australia	SA	Adelaide	1,878,029
Tasmania	TAS	Hobart	575,366

Blocks

Code blocks without syntax highlighting:

var printText = $('.text').data('text');
var contentArray = printText.split('/n');

Code blocks with language specified for highlighting:

var printText = $('.text').data('text');

var contentArray = printText.split('/n');
$.each(contentArray, function(index, newLine) {
  $('.text').append('<span style="display:block;" id="'+index+'"></span>');
  
  var lineID = index;
  var self = $(this);
    setTimeout(function () {
      $.each(self, function(index, chunk){
          setTimeout(function () {
            $('#'+lineID).append("<span>"+chunk+"</span>");
            $('body, html').scrollTop($(document).height());
          }, index*5);
      });
      
    }, index*100);
});

Block quotes:

And in her mind saw again the line of desert hills beyond the stone balustrade of the hotel room balcony, and the faint crease of dawn-light above, suddenly swamped by the stuttering pulses of silent fire from beyond the horizon. She had watched – dazed and dazzled and wondering – as that distant eruption of annihilation had lit up the face of her lover

Footnotes, sidenotes

It has traditionally¹ been considered a necessity that any blog worthy of the name be overrun by a hedonistic number of footnotes that the author² uses to go on pointless tangents, and it is therefore important that this blog support this worthy activity. Margin comments are supported (on the left and the right). You can float quotes (or whatever) to the left or the right

I … cannot think of anything except evil³ applications.

Oh well.

Such a shame.

Moving on.

Equations

Inline equations work for simple expressions like \(x^2\), but it’s better to switch to display mode for more complex expressions. If I wanted to illustrate that a Maclaurin series expansion is a Taylor series expansion of \(f(x)\) around \(x = 0\), I’d do this:

$$ f(0) + \frac{f^\prime(0)}{1!} x + \frac{f^{\prime\prime}(0)}{2!} x^2 + \frac{f^{\prime\prime\prime}(0)}{3!} x^3 + \ldots $$

Code

(12 ^ 2) / 3.14

#> [1] 45.85987

library(stringr)
library(ggplot2)
library(tibble)
library(dplyr)

msg <- "hello cruel world"
msg |> 
  str_to_upper() |> 
  str_view("WORLD")

#> [1] │ HELLO CRUEL <WORLD>

The litedown package defaults to xfun::record_print() for printing data frames and tibbles, which in turn uses xfun::md_table() to render the object as a markdown table. That produces results like this:

starwars |> 
  select(name:homeworld, species) |> 
  filter(species == "Human")

name	height	mass	hair_color	skin_color	eye_color	birth_year	sex	gender	homeworld	species
Luke Skywalker	172	77.0	blond	fair	blue	19.0	male	masculine	Tatooine	Human
Darth Vader	202	136.0	none	white	yellow	41.9	male	masculine	Tatooine	Human
Leia Organa	150	49.0	brown	light	brown	19.0	female	feminine	Alderaan	Human
Owen Lars	178	120.0	brown, grey	light	blue	52.0	male	masculine	Tatooine	Human
Beru Whitesun Lars	165	75.0	brown	light	blue	47.0	female	feminine	Tatooine	Human
⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮
Raymus Antilles	188	79.0	brown	light	brown		male	masculine	Alderaan	Human
Finn			black	dark	dark		male	masculine		Human
Rey			brown	light	hazel		female	feminine		Human
Poe Dameron			brown	light	brown		male	masculine		Human
Captain Phasma			none	none	unknown		female	feminine		Human

You can specify your own print options to change this behaviour, or you can just call print() explicitly:

starwars |> 
  select(name:homeworld, species) |> 
  filter(species == "Human") |> 
  print()

#> # A tibble: 35 × 11
#>    name     height  mass hair_color skin_color eye_color birth_year sex   gender
#>    <chr>     <int> <dbl> <chr>      <chr>      <chr>          <dbl> <chr> <chr> 
#>  1 Luke Sk…    172    77 blond      fair       blue            19   male  mascu…
#>  2 Darth V…    202   136 none       white      yellow          41.9 male  mascu…
#>  3 Leia Or…    150    49 brown      light      brown           19   fema… femin…
#>  4 Owen La…    178   120 brown, gr… light      blue            52   male  mascu…
#>  5 Beru Wh…    165    75 brown      light      blue            47   fema… femin…
#>  6 Biggs D…    183    84 black      light      brown           24   male  mascu…
#>  7 Obi-Wan…    182    77 auburn, w… fair       blue-gray       57   male  mascu…
#>  8 Anakin …    188    84 blond      fair       blue            41.9 male  mascu…
#>  9 Wilhuff…    180    NA auburn, g… fair       blue            64   male  mascu…
#> 10 Han Solo    180    80 brown      fair       brown           29   male  mascu…
#> # ℹ 25 more rows
#> # ℹ 2 more variables: homeworld <chr>, species <chr>

1. By homosexuals ↩

2. Noted transsexual ↩

3. Bisexual ↩