Miuler

#!/usr/bin/env bash

function get_headphones_index() {
  echo $(pacmd list-cards | grep bluez_card -B1 | grep index | awk '{print $2}')
}

function get_headphones_mac_address() {
  local temp=$(pacmd list-cards | grep bluez_card -C20 | grep 'device.string' | cut -d' ' -f 3)
  temp="${temp%\"}"
  temp="${temp#\"}"

ryanlecompte

import scala.collection._
import com.twitter.util._

scala> val buffer = mutable.ArrayBuffer.empty[Int]
scala> println(Time.measure { (0 to 50000000).foreach { buffer += _ } }.inMillis)
17610

scala> var vector = immutable.Vector.empty[Int]
scala> println(Time.measure { (0 to 50000000).foreach { vector :+= _ } }.inMillis)
7865

alexanderjarvis

import play.api.libs.json._
import play.api.libs.functional.syntax._
import play.api.data.validation._

implicit def tuple2Reads[A, B](implicit aReads: Reads[A], bReads: Reads[B]): Reads[Tuple2[A, B]] = Reads[Tuple2[A, B]] {
  case JsArray(arr) if arr.size == 2 => for {
    a <- aReads.reads(arr(0))
    b <- bReads.reads(arr(1))
  } yield (a, b)
  case _ => JsError(Seq(JsPath() -> Seq(ValidationError("Expected array of two elements"))))

wspringer

object lzw {
  
  trait Appendable[T] {
    def append(value: T)
  }

  import scala.collection.generic._
  case class GrowingAppendable[T](growable: Growable[T]) extends Appendable[T] {
    def append(value: T) {
      growable += value

newhouseb

The basic idea here is to substantiate the claims made by this square post:
http://corner.squareup.com/2011/06/postgresql-data-is-important.html

In PostgreSQL, and MySQL (MyISAM and InnoDB) I create millions of rows and then add 
and remove columns and add and remove indexes.  For columns without defaults this is
basically free in PostgreSQL and O(n) in MySQL.  For adding indexes its at best O(n) 
everywhere, but with PostgreSQL it claims not to do any locking that would otherwise
prevent table interaction.

Also, PostgreSQL has _awsome_ documentation (it has real examples!). I always get