muraiki

lazy semantics and lambda abstractions
point-free in style and pure computation
memoization gives simple caching
these are a few of my functional things

when the state bites
when the C stings
when impure is bad
I simply remember my functional things
and then I don't feel so mad

muraiki

(ns ajax-to-websocket.core
  (:require [org.httpkit.server :as server]
            [org.httpkit.client :as client]
            [clojure.data.json :as json]
            [clojure.data :as data]
            [clojure.core.async :refer [chan <! >! go timeout onto-chan]]))

(defn channel-closed
  "called when websocket channel is closed"
  [status]

muraiki

subset NonNegativeInt of Int where * >= 0;

proto fib (|) is cached returns NonNegativeInt {*}
multi fib (0) { 0 }
multi fib (1) { 1 }
multi fib (NonNegativeInt $n) { fib($n - 1) + fib($n - 2) }

say fib(100)

muraiki

def groupBy[A](xs: List[A]): Map[A, Int] =
  xs.foldLeft(Map[A, Int]()) { (m: Map[A, Int], x: A) => m + (x -> (m.get(x).getOrElse(0) + 1)) }

muraiki

// map the keys in json to the properties on your model
var desiredKeys = {
  "foo": "foo",
  "bar": "bar"
};

Object.defineProperty(self, 'updateFromJson', {
  enumerable: true,
  value: function (data) {
    Object.keys(data)

muraiki

function FooModel () {
  Object.defineProperties(this, {
    _foo: {
      value: ko.observable(x.name),
      enumerable: true,
      configurable: true
    },
    _bar: {
      value: ko.observable(x.server_id || x.instance_id || x.instanceId),
      enumerable: true,

muraiki

use strict;
use warnings;
 
open (my $foo, '<', 'foo.txt') or die;
open (my $bar, '<', 'bar.txt') or die;
open (my $merged, '>', 'merged.txt') or die;

print $merged '#!/bin/sh', "\n";
 
while (not eof $foo and not eof $bar) {

muraiki

# Intro to anonymous functions in Perl

use strict;
use warnings;
use feature qw(say);
use utf8;
binmode STDOUT, ':utf8';

# You can declare a sub without giving it a name. Hence, "anonymous" function.
sub { say 'this sub will never be called' };

muraiki

my $PATH = '.';
my $USER = 'muraiki';
my $GROUP = 'staff';

IO::Notification.watch_path($PATH)\
    .unique(:as(*.path), :expires(1))\
    .map(*.path)\
    .grep(* ~~ /\.sock/)\
    .act(-> $socket {
        say "Socket created: $socket";  # actually this happens for any I/O on the file, not just creation

muraiki

# disclaimer: I'm a perl6 noob :)

my $out = Supply.new;
$out.act: -> $s { say $s }; # actor model semantics; only ever execute this in 1 thread

my $watcher = IO::Notification.watch-path($*CWD.abspath)\
  .grep(*.event.isa(FileChangeEvent::FileChanged))\
  .unique(:as(*.path), :expires(1))\  # unique paths over last second, to prevent double-triggering from metadata events
  .map(*.path.IO)\ # convert event path strings to IO::Path objects
  .grep(*.extension eq 'p6')\