ofan

Lisp interpreter in 90 lines of C++

I've enjoyed reading Peter Norvig's recent articles on Lisp. He implements a Scheme interpreter in 90 lines of Python in the first, and develops it further in the second.

Just for fun I wondered if I could write one in C++. My goals would be

1. A Lisp interpreter that would complete Peter's Lis.py test cases correctly...
2. ...in no more than 90 lines of C++.

Although I've been thinking about this for a few weeks, as I write this I have not written a line of the code. I'm pretty sure I will achieve 1, and 2 will be... a piece of cake!

incredimike

// Lists of countries with ISO 3166 codes, presented in various formats.
// Last Updated: July 30, 2020

// If you're using PHP, I suggest checking out:
// https://github.com/thephpleague/iso3166
// or Laravel: https://github.com/squirephp/squire
// 
// JS developers can check out:
// https://www.npmjs.com/package/iso3166-2-db
//

kyanny

defmodule Fib do 
  def fib(0) do 0 end
  def fib(1) do 1 end
  def fib(n) do fib(n-1) + fib(n-2) end
end

IO.puts Fib.fib(10)

vitch

#graph svg g.us rect 
{
	fill: url(#tile-us) #cccccc;
}
#graph svg g.worldwide rect 
{
	fill: url(#tile-ww) #cccccc;
}

mbostock

license: gpl-3.0
redirect: https://observablehq.com/@d3/selection-join

adamwiggins

Make it real

Ideas are cheap. Make a prototype, sketch a CLI session, draw a wireframe. Discuss around concrete examples, not hand-waving abstractions. Don't say you did something, provide a URL that proves it.

Ship it

Nothing is real until it's being used by a real user. This doesn't mean you make a prototype in the morning and blog about it in the evening. It means you find one person you believe your product will help and try to get them to use it.

Do it with style

6174

 //http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
 Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);

vipickering

var array = [];

function closest(array,num){
    var i=0;
    var minDiff=1000;
    var ans;
    for(i in array){
         var m=Math.abs(num-array[i]);
         if(m<minDiff){ 
                minDiff=m; 

MarcDiethelm

This text now lives at https://github.com/MarcDiethelm/contributing/blob/master/README.md. I turned it into a Github repo so you can, you know, contribute to it by making pull requests.

---

Contributing

If you want to contribute to a project and make it better, your help is very welcome. Contributing is also a great way to learn more about social coding on Github, new technologies and and their ecosystems and how to make constructive, helpful bug reports, feature requests and the noblest of all contributions: a good, clean pull request.

mattdesl

/* 
Uploads to GPU immediately when the image is ready, then fires callback.

    //takes a string path or image/canvas/video/ImageData
    uploadTexture(renderer, pathOrImage, function(err, texture) {
        if (err) console.error(err)
        //do something with the ThreeJS 'texture' result
    })
*/
var THREE = require('three');