tonymorris

{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE DeriveFunctor #-}

import Control.Lens
import Prelude hiding (readFile, writeFile, print)
import qualified Prelude as Prelude(readFile, writeFile, print)

Kelfitas

sudo su
apt-get install -y autoconf automake libtool nasm make pkg-config
cd /tmp
wget https://github.com/mozilla/mozjpeg/releases/download/v3.1/mozjpeg-3.1-release-source.tar.gz
tar -xvf mozjpeg-3.1-release-source.tar.gz
cd mozjpeg
autoreconf -fiv
mkdir build && cd build
sh ../configure
make install

KodrAus

Profiling performance

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

chris-martin

Standardized Ladder of Functional Programming

The LambdaConf Ladder of Functional Programming (LOFP) is a standardized progression of different concepts and skills that developers must master on their journey to becoming expert-level functional programmers. LOFP can be used to rank workshops, talks, presentations, books, and courseware, so that aspiring functional programmers have a better understanding of what material is appropriate for them given their current experience.

Fire Keramik

Concepts

• Immutable Data
• Second-order Functions

rob-brown

defmodule ZipList do
  defstruct previous: [], current: nil, remaining: []

  def from_list(list, index \\ 0)
  def from_list([], _), do: {:error, :empty_list}
  def from_list(list, index) when length(list) < index, do: {:error, :index_out_of_bounds}
  def from_list(list, index) when is_list(list) do
    previous = list |> Enum.take(index) |> Enum.reverse
    [current | remaining] = Enum.drop list, index
    ziplist = %__MODULE__{previous: previous, current: current, remaining: remaining}

djspiewak

Getting Started in Scala

This is my attempt to give Scala newcomers a quick-and-easy rundown to the prerequisite steps they need to a) try Scala, and b) get a standard project up and running on their machine. I'm not going to talk about the language at all; there are plenty of better resources a google search away. This is just focused on the prerequisite tooling and machine setup. I will not be assuming you have any background in JVM languages. So if you're coming from Python, Ruby, JavaScript, Haskell, or anywhere…  I hope to present the information you need without assuming anything.

Disclaimer It has been over a decade since I was new to Scala, and when I was new to Scala, I was coming from a Java and Ruby background. This has probably caused me to unknowingly make some assumptions. Please feel free to call me out in comments/tweets!

One assumption I'm knowingly making is that you're on a Unix-like platform. Sorry, Windows users.

Getting the JVM

btroncone

RxJS 5 Operators By Example

⚠️ UPDATE: I have moved the contents of this gist plus more to http://www.learnrxjs.io and https://github.com/btroncone/learn-rxjs. For expanded examples, explanations, and resources, please check out this new location!

A complete list of RxJS 5 operators with easy to understand explanations and runnable examples.

Table of Contents

• buffer
• bufferCount
• bufferTime

bkaradzic

Orthodox C++

This article has been updated and is available here.

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

seanislegend

let timeout = 1000;

/**
 * Create a custom observable that creates a XHR request and returns complete when the promise is fulfilled 
 */
let observable = Rx.Observable.create((o) => {
    dataService.fetch('test.json')
        .then((data) => {
            o.onNext(data);
            o.onCompleted();