ion1

Emulating the elegance of JavaScript's new Array in Haskell

What does new Array(x) do? Trick question. It does different things depending on whether x is an integer or something else.

I wanted to replicate this elegant functionality in Haskell: behold.

int-index

{-# LANGUAGE KindSignatures, DataKinds, FlexibleInstances, FlexibleContexts,
             FunctionalDependencies, TypeFamilies, TypeOperators,
             PatternSynonyms, UndecidableInstances, ConstraintKinds,
             TypeApplications, ScopedTypeVariables, CPP #-}

module NamedDefaults (FillDefaults, fillDefaults, (!.)) where

import Prelude (Maybe(..), id)
import Data.Kind (Type)

kevroletin

I've been working quite extensively with Wizek during last several days. In few words: I am very motivated by my experience and I hope that there will be a community for pair-programming. My intuition is that you exchange your time for the ability to stay focused and motivated.

Below is more structured feedback.

Open questions: I was working with a haskeller who is more experienced than me and I was working on a completely new project. I think that there are different possible setups which will lead to a different experience:

• working with someone who has the same or smaller amount of experience;
• working on something very familiar to you.

Positive feedback:

3noch

:set prompt "> "
:set -isrc
:load Main

Profpatsch

let
  hpack2nix =
    name: src:
    let
      addCabalFile = stdenv.mkDerivation {
        inherit name src;
        phases = [ "unpackPhase" "patchPhase" "installPhase" ];
        installPhase = ''cp -r . $out'';
        patchPhase = ''
          ${haskellPackages.hpack}/bin/hpack

olejorgenb

#!/bin/usr/env bash
# Originaly from: https://www.reddit.com/r/NixOS/comments/5yxt45/simple_nix_package_search/

nq () {
  local CACHE="$HOME/.cache/nq-cache"
  if ! ( [ -e $CACHE ] && [ $(stat -c %Y $CACHE) -gt $(( $(date +%s) - 3600*24*7 )) ] ); then
      # read gotcha.. can't pipe to read (as usual zsh beats bash)
      read x MEM_AVAIL_KB UNIT < <(grep MemAvailable: /proc/meminfo) 
      if [[ $UNIT != "kB" || $MEM_AVAIL_KB -lt 1000000 ]]; then
          # nix-env can easily use up to 1GB during -qa

lspitzner

sublime3 and ghcid setup for quick haskell coding feedback

tested on sublime 3

(you can omit the SublimeOnSaveBuild steps, as the result is not
completely reliable anyways. i still find it useful, though.)

steps:
- install https://github.com/lspitzner/SublimeOnSaveBuild
  (original from alexnj; in his/her version the build-window gets closed

scottlinux

#!/usr/bin/env bash
#
# Backup selected directories to a Backblaze B2 bucket
#
# Example daily cron:
# @daily /usr/local/bin/b2backup >/dev/null
#

# Account creds
id=xxxxxxxxxx

novaluke

Nix seems perfect for developers - until I try to use it...

Want to use Nix for development but you're not sure how? Concerned about the fluidity of nixpkgs channels or not being able to easily install arbitrary package versions?

When I first heard about Nix it seemed like the perfect tool for a developer. When I tried to actually use it for developing and deploying web apps, though, the pieces just didn't seem to add up.

Wizek

function c () {
  console.log.apply(console, arguments)
  return arguments[arguments.length-1]
}

var unboundSlice = Array.prototype.slice
var slice = Function.prototype.call.bind(unboundSlice)