nexneo

Types

A type is a collection of possible values. An integer can have values 0, 1, 2, 3, etc.; a boolean can have values true and false. We can imagine any type we like: for example, a HighFive type that allows the values "hi" or 5, but nothing else. It's not a string and it's not an integer; it's its own, separate type.

Statically typed languages constrain variables' types: the programming language might know, for example, that x is an Integer. In that case, the programmer isn't allowed to say x = true; that would be an invalid program. The compiler will refuse to compile it, so we can't even run it.

nexneo

build_package_patched() {
  # These three patches are included when RVM builds REE
  cd source
  wget 'https://github.com/wayneeseguin/rvm/raw/master/patches/ree/1.8.7/tcmalloc.patch'
  wget 'https://github.com/wayneeseguin/rvm/raw/master/patches/ree/1.8.7/stdout-rouge-fix.patch'
  wget 'https://github.com/wayneeseguin/rvm/raw/master/patches/ree/1.8.7/no_sslv2.diff'
  patch -p1 < tcmalloc.patch
  patch -p1 < stdout-rouge-fix.patch
  patch -p1 < no_sslv2.diff
  cd ..

nexneo

#!/bin/sh

# Demo http://ascii.io/a/3019

# build with debug flags
go build -gcflags "-N -l" -o out

# find the debugger comments
awk '/\/\/debugger/ { print "break " FILENAME ":" FNR; }' `find $PWD -name "*.go" | xargs` > .breakpoints

nexneo

A Capistrano Rails Guide

by Jonathan Rochkind, http://bibwild.wordpress.com

why cap?

Capistrano automates pushing out a new version of your application to a deployment location.

I've been writing and deploying Rails apps for a while, but I avoided using Capistrano until recently. I've got a pretty simple one-host deployment, and even though everyone said Capistrano was great, every time I tried to get started I just got snowed under not being able to figure out exactly what I wanted to do, and figured I wasn't having that much trouble doing it "manually".

nexneo

L1 cache reference                  0.5 ns
Branch mispredict                   5 ns
L2 cache reference                  7 ns
Mutex lock/unlock                   25 ns
Main memory reference               100 ns
Compress 1K bytes with Zippy        3,000 ns
Send 2K bytes over 1 Gbps network   20,000 ns
Read 1 MB sequentially from memory  250,000 ns
Round trip within same datacenter   500,000 ns
Disk seek                           10,000,000 ns

nexneo

module Jobs
  module ScheduledJob
    def self.included(base)
      base.extend(ClassMethods)
    end
  	  
    def perform_with_schedule
      Delayed::Job.enqueue self, 0, self.class.schedule.from_now.getutc
      perform_without_schedule
    end

nexneo

;; javasound
(import '(javax.sound.sampled AudioSystem Line DataLine DataLine$Info SourceDataLine TargetDataLine AudioFormat))

(defn get-audio-format [samplerate bitsize channels]
  	(new AudioFormat samplerate bitsize channels true false))

(defn get-source-data-line-info [audioformat]
  (new DataLine$Info SourceDataLine audioformat))

(defn get-source-data-line [datalineinfo]