arkadijs

React Native workshop

The instructions below are shortened version of Facebook React Native guides:

• [Getting started]
• [Android SDK setup]
• [Running on Android device]
• [Running on iOS device]

Mac OS X

arkadijs

Elixir hackathon

A 16-core Linux VM in the cloud with 104GB of RAM for running search engines:

ssh-add workshop.pem 
ssh [email protected]

A smaller 8-core, 7GB RAM VM in the same zone for running performance tests:

ssh [email protected]

arkadijs

#![feature(convert, slice_patterns)]
#![allow(unused_variables)]

// http://pzol.github.io/getting_rusty/posts/20140417_destructuring_in_rust/

use std::env;
use std::io::BufReader;
use std::io::BufRead;
use std::fs::File;

arkadijs

#![allow(dead_code, unused_variables)]

#[derive(Debug)]
struct Node<'l, 'r> {
    val: u32,
    left: Option<&'l Node<'l, 'l>>,
    right: Option<&'r Node<'r, 'r>>
}

impl<'l, 'r> Node<'l, 'r> {

arkadijs

  def a(b: List[AnyRef]): List[String] =
    b.foldLeft(List[String]())((c, d) => d match {
      case null => c
      case e: String => c :+ e
      case f: List[AnyRef] => c ++ a(f)
    })

  def g(h: List[String]) =
    h.foldLeft(List[String]())((i, j) => i.lastOption match {
      case Some(`j`) => i

arkadijs

Reactive workshop

Today we're building Instagram image scraper.

Instagram has an API to poll for recent media to get media's attributes, including URL and location. Your program will be sending that information to a pre-cooked web UI for display.

Step zero: Necessary evil

Please login into Instagram, go to https://instagram.com/developer/ and create an app (Manage Client > Register a New Client) to obtain Client ID that is required to call Instagram's API. You may put http://rxdisplay.neueda.lv/ into Website and http://rxdisplay.neueda.lv/oauth into OAuth redirect uri. Any other URL-s would do too.

arkadijs

1. Koding - Attach your own VM. Nice UI. Has Chrome app.
2. Cloud9 - 512MB free tier memory limit. Scala and Groovy processes will be killed pretty soon due to OOM.
3. Codenvy - Docker runners automagic fail (cannot run arbitrary startup command). Can show Javadoc.
4. Nitrous - defunct.
5. Codebox - defunct.

arkadijs

@Grapes([
    @Grab('io.reactivex:rxgroovy:1.0.0'),
    @Grab('org.codehaus.gpars:gpars:1.2.1'),
    @Grab('com.github.groovy-wslite:groovy-wslite:1.1.0')])

import groovy.transform.EqualsAndHashCode
import groovy.transform.ToString
import rx.Observable
import rx.Subscriber
import rx.schedulers.Schedulers

arkadijs

@Grapes([
    @Grab('org.codehaus.gpars:gpars:1.2.1'),
    @Grab('com.github.groovy-wslite:groovy-wslite:1.1.0'),
    @Grab('io.ratpack:ratpack-groovy:0.9.15'),
    //@Grab('io.ratpack:ratpack-jackson:0.9.15'),
    @Grab('org.slf4j:slf4j-simple:1.7.12')])

import static groovyx.gpars.actor.Actors.actor
import static ratpack.groovy.Groovy.ratpack
import ratpack.http.client.HttpClient

arkadijs

thread '<main>' panicked at 'index out of bounds: the len is 1339 but the index is 1339', /build/buildd/rust-nightly-201503180407~1ae32de~trusty/src/libcollections/vec.rs:1336
stack backtrace:
   1:     0x7feb92fed9d4 - sys::backtrace::write::h781dfe74347a79cb10C
   2:     0x7feb92ff15df - panicking::on_panic::hafa4f854a38dccfathJ
   3:     0x7feb92fe248a - rt::unwind::begin_unwind_inner::hea0351e9a595ba7f2XI
   4:     0x7feb92fe2b41 - rt::unwind::begin_unwind_fmt::he1aaa061d26e63b9DWI
   5:     0x7feb92ff0fc7 - rust_begin_unwind
   6:     0x7feb9301cb94 - panicking::panic_fmt::h6d00c31e190682d1Tku
   7:     0x7feb9301defc - panicking::panic_bounds_check::hf4aded192863f504Zju
   8:     0x7feb92f07536 - vec::Vec<T>.Index<usize>::index::h1583112471073907091