smarter

Generalized Algebraic Data Types in Scala

Basic GADTs

Here's an ADT which is not a GADT, in Haskell:

data Expr = IntExpr Int | BoolExpr Bool

poteto

defmodule MyApp.Client do
  @moduledoc """
  Generic client wrapper for an API service. Pass in an adapter like HTTPoison.
  """
  alias MyApp.Service # API credentials struct

  def build_url(path, %Service{url: url, auth: %{}}), do: append(url, "/") <> path
  def build_url(path, queries, service) do
    query_params = URI.encode_query(queries)
    build_url(path, service) <> "?" <> query_params

Fristi

package nl.mdj

import scala.concurrent.duration._
import scala.concurrent.{Await, Future}
import scala.util.{Failure, Success, Try}
import scalaz.Scalaz._
import scalaz._

object Transformers extends App {

gigiigig

import shapeless._

import scalaz._
import Scalaz._

object console extends App {

  trait Foo[A] {
    type B
    def value: B

jmrr

val sqlContext = new org.apache.spark.sql.SQLContext(sc) // optional

val df = sqlContext.load("jdbc", Map(
          "url" -> "jdbc:mysql://<ip.address.your.db>/<table>?user=<username>&password=<pwd>",
          "dbtable" -> "<tablename>"))

df.select("<col1>","<col2>","<col3>").save("</path/to/parquet/file.parquet>","parquet")

//Alternatively, to save all the columns:

mariozig

# Assume we are in your home directory
cd ~/

# Clone the repo from GitLab using the `--mirror` option
$ git clone --mirror git@your-gitlab-site.com:mario/my-repo.git

# Change into newly created repo directory
$ cd ~/my-repo.git

# Push to GitHub using the `--mirror` option.  The `--no-verify` option skips any hooks. 

garybernhardt

(Chapters marked with * are already written. This gets reorganized constantly
and 10 or so written chapters that I'm on the fence about aren't listed.)

Programmer Epistemology
  * Dispersed Cost vs. Reduced Cost
  * Verificationist Fallacy
  * Mistake Metastasis
  The Overton Window
  Epicycles All The Way Down
  The Hyperspace Gates Were Just There

jberkus

WITH table_scans as (
    SELECT relid,
        tables.idx_scan + tables.seq_scan as all_scans,
        ( tables.n_tup_ins + tables.n_tup_upd + tables.n_tup_del ) as writes,
                pg_relation_size(relid) as table_size
        FROM pg_stat_user_tables as tables
),
all_writes as (
    SELECT sum(writes) as total_writes
    FROM table_scans

jimbojsb

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)

Step 2: