gfredericks

;; 0:
(-> Math/E Math/toRadians Math/round)
;; 1:
(-> Math/E Math/log Math/round)
;; 2:
(-> Math/E Math/sqrt Math/round)
;; 3:
(-> Math/E Math/round)
;; 4:
(-> Math/PI Math/ceil Math/round)

amaia

ruby -e "Dir.glob('*.yml.example'){|x| system \"cp #{x}  #{x.split('.')[0..-2].join('.')}\"}"

moiristo

# Rails3 way to redirect non-www domain to www domain

# Single domain redirect
'example.com'.tap do |host|
  constraints(:host => host) do
    match '/(*path)', :to => redirect { |params, request| Addressable::URI.escape request.url.sub(host, "www.#{host}") }
  end
end

jpmckinney

# blog post: http://blog.slashpoundbang.com/post/12938588984/google-refine-fingerprint-clustering-algorithm-in-ruby

# coding: utf-8
require 'unicode_utils/downcase'

class String
  # Normalize spaces and fingerprint.
  # http://code.google.com/p/google-refine/wiki/ClusteringInDepth
  # http://code.google.com/p/google-refine/source/browse/trunk/main/src/com/google/refine/clustering/binning/FingerprintKeyer.java
  def fingerprint

tmcw

function sample(list, m) {
    var n = list.length;
    if (m > n) return void console &&
        console.log('list length must be > sample');
    var sampleList = [];
    for (var i = n - m; i < n; i++) {
        var item = list[~~(Math.random() * i)];
        if (sampleList.indexOf(item) !== -1)
            sampleList.push(list[i]);
        else

BurntSushi

// This is *not* valid Go!

func Map(f func(A) B, xs []A) []B {
    ys := make([]B, len(xs))
    for i, x := range xs {
        ys[i] = f(x)
    }
    return ys
}
Map(func(x int) int { return x * x }, []int{1, 2, 3})

max-mapper

// data comes from here http://stat-computing.org/dataexpo/2009/the-data.html
// download 1994.csv.bz2 and unpack by running: cat 1994.csv.bz2 | bzip2 -d > 1994.csv
// 1994.csv should be ~5.2 million lines and 500MB
// importing all rows into leveldb took ~50 seconds on my machine

// there are two main techniques at work here:
// 1: never create JS objects, leave the data as binary the entire time (binary-split does this)
// 2: group lines into 16 MB batches, to take advantage of leveldbs batch API (byte-stream does this)

var level = require('level')

ashleybot

d3.xml("/data/GoldenGate2012Results.xml", function(xml) {
	
  var runners = d3.select(xml).selectAll("runner")[0];
  var table = d3.select("#presentation").append("table").attr("class","grid");
	
  var thead = table.append("thead");
  thead.append("th").text("Gender");
  thead.append("th").text("City");
  thead.append("th").text("Time");
  thead.append("th").text("Pace");

sstephenson

# Clone rbenv into ~/.rbenv
git clone git@github.com:sstephenson/rbenv.git ~/.rbenv

# Add rbenv to your PATH
# NOTE: rbenv is *NOT* compatible with rvm, so you'll need to 
# remove rvm from your profile if it's present. (This is because
# rvm overrides the `gem` command.)
echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/shims:$PATH"' >> ~/.bash_profile
exec $SHELL

mbostock

Collections

each(array)

Underscore example:

_.each([1, 2, 3], function(num) { alert(num); });