Pet3ris

;                    Quick miniKanren-like code 
;
; written at the meeting of a Functional Programming Group
; (Toukyou/Shibuya, Apr 29, 2006), as a quick illustration of logic
; programming.  The code is really quite trivial and unsophisticated:
; it was written without any preparation whatsoever. The present file
; adds comments and makes minor adjustments.
;
; $Id: sokuza-kanren.scm,v 1.1 2006/05/10 23:12:41 oleg Exp oleg $

Gozala

// Lack of tail call optimization in JS
var sum = function(x, y) {
  return y > 0 ? sum(x + 1, y - 1) :
         y < 0 ? sum(x - 1, y + 1) :
         x
}

sum(20, 100000) // => RangeError: Maximum call stack size exceeded

// Using workaround

andyhd

function lens(get, set) {
  var f = function (a) { return get(a); };
  f.set = set;
  f.mod = function (f, a) { return set(a, f(get(a))); };
  return f;
}

var first = lens(
  function (a) { return a[0]; },
  function (a, b) { return [b].concat(a.slice(1)); }

futuremill-ltd

# From a fresh install of squeeze
apt-get install ruby rubygems # Need ruby to use fpm
gem1.8 install fpm --no-ri --no-rdoc

apt-get install build-essential openssl libreadline6 libreadline6-dev zlib1g zlib1g-dev libssl-dev ncurses-dev libyaml-dev

wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p125.tar.gz
tar -zxvf ruby-1.9.3-p125.tar.gz
cd ruby-1.9.3-p125
rm -rf /tmp/ruby193

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

disnet

macro sexp {
  case () => {
    ; 
  }
  case ($p) => {
    $p
  }
  case ($x $y) => {
    $x($y);
  }

domenic

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

hallettj

/*
 * Example of a state monad in use.  This is adapted from an example on
 * the Haskell Wiki:
 * http://www.haskell.org/haskellwiki/State_Monad#Complete_and_Concrete_Example_1
 */
require(['state', 'qunit'], function(state, qunit) {

    /*
     * playGame() is a recursive function that given an array of moves
     * defines an algorithm for constructing a final game score.  Along

AutoSponge

inspired to understand this from:

• http://raganwald.com/2013/03/28/trampolines-in-javascript.html
• http://bilby.brianmckenna.org/#trampoline see http://en.wikipedia.org/wiki/Trampoline_(computing)

compare with https://github.com/Gozala/js-tail-call/blob/master/core.js for speed (after refactoring to work like his does)

http://jsperf.com/tail-call-head-to-head

AutoSponge

function shift(arr, i) {
    var cut = arr.length - i;
    return arr.slice(cut).concat(arr.slice(0, cut));
}

var arr = [1,2,3,4,5];
shift(arr, 1); //[5, 1, 2, 3, 4]
shift(arr, 3); //[3, 4, 5, 1, 2]