dvliman

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called (Functional) Reactive Programming (FRP).

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

dvliman

var config = {
  ga: 'UA-54546159-4'
};
/**
 * Botinder
 */

// Init app
var Botinder = Ember.Application.create({
  rootElement: '#app'

dvliman

"use strict";
var ApplicationConfiguration = function() {
    var applicationModuleName = "backer-news",
        applicationModuleVendorDependencies = ["ngResource", "ngCookies", "ngAnimate", "ngTouch", "ngSanitize", "ui.router", "ui.bootstrap", "ui.utils"],
        registerModule = function(moduleName, dependencies) {
            angular.module(moduleName, dependencies || []), angular.module(applicationModuleName).requires.push(moduleName)
        };
    return {
        applicationModuleName: applicationModuleName,
        applicationModuleVendorDependencies: applicationModuleVendorDependencies,

dvliman

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs 4X memory

dvliman

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;

class Person {
  protected:
    string name;
    string address;

dvliman

package main

import (
	"encoding/json"
	"log"
	"net/http"
	"reflect"
	"time"

	"github.com/gorilla/context"

dvliman

Journey

I was using Boot2Docker 1.2 (OSX) and wanted to use volume for MongoDB. First nothing was happening because 1.2 has no Guest Additions and volumes don't work. There is a workaround by making a boot2docker.iso from master which has Guest Additions.

But then Mongo didn't like putting data on VirtualBox's shared folders:

[initandlisten] 	WARNING: This file system is not supported. For further information see:
[initandlisten] http://dochub.mongodb.org/core/unsupported-filesystems

dvliman

# rob houses (3,5,1,7,9) where the rule is
# you can not rob adjacent houses and the goal
# is to get the maximum sum value

# 3 => 3
# 3, 5 => 5
# 3, 5, 1 => 5
# 3, 5, 1, 7 => 12
# ...
# 3, 5, 1, 7, 9

dvliman

drwxr-xr-x    7 dv  staff   238B Jul 18  2014 HackerSwifter
drwxr-xr-x   27 dv  staff   918B Aug 17 15:46 NewsBlur
drwxr-xr-x   11 dv  staff   374B Jun 24  2014 ScalaWebscraper
drwx------@   6 dv  staff   204B May 10  2014 ScrapeBox
drwxr-xr-x   20 dv  staff   680B Jul 18  2014 SwiftHN
drwxr-xr-x   18 dv  staff   612B Dec 25 14:06 atlas
drwxr-xr-x   24 dv  staff   816B Sep  9 10:53 beansdb
drwxr-xr-x   33 dv  staff   1.1K Aug 21 21:44 bolt
drwxr-xr-x   11 dv  staff   374B Jul 16  2014 buggy
drwxr-xr-x   10 dv  staff   340B Sep  8 22:05 cloudtunes

dvliman

if you installed node pkg from official website, here is how to uninstall

sudo rm -rf /usr/local/lib/node /usr/local/lib/node_modules /var/db/receipts/org.nodejs.*
sudo rm -rf /usr/local/include/node /Users/$USER/.npm
sudo rm /usr/local/bin/node
sudo rm /usr/local/share/man/man1/node.1
brew install node