This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.
To capture the video (filesize: 19MB), using the free "QuickTime Player" application:
var ngAppElem = angular.element(document.querySelector('[ng-app]') || document); | |
window.$injector = ngAppElem.injector(); | |
window.inject = $injector.invoke; | |
window.$rootScope = ngAppElem.scope(); | |
// getService('auth') will create a variable `auth` assigned to the service `auth`. | |
var getService = serviceName => | |
inject([serviceName, s => window[serviceName] = s]); |
class User < Params.over(:first_name, :last_name) | |
def info | |
"I am a user: #{@first_name} #{@last_name}" | |
end | |
end | |
class Admin < User.params(:awesomeness_level) | |
def info | |
"I am a level #{@awesomeness_level} admin: #{@first_name} #{@last_name}" | |
end |
class SimpleLinearRegression | |
def initialize(xs, ys) | |
@xs, @ys = xs, ys | |
if @xs.length != @ys.length | |
raise "Unbalanced data. xs need to be same length as ys" | |
end | |
end | |
def y_intercept | |
mean(@ys) - (slope * mean(@xs)) |
# Convert any YouTube video into an audio file you can listen to on the go, using: | |
# http://rg3.github.com/youtube-dl/ | |
{ ~ } > brew install ffmpeg | |
{ ~ } > wget https://raw.github.com/rg3/youtube-dl/2012.02.27/youtube-dl | |
{ ~ } > chmod u+x youtube-dl | |
# Pick which video format you want to download.. (use any YT video link) | |
{ ~ } > ./youtube-dl -s -F http://www.youtube.com/watch?v=vT1KmTQ-1Os |
# switch default editor for pry to sublime text | |
Pry.config.editor = "sublime" | |
# format prompt to be <Rails version>@<ruby version>(<object>)> | |
Pry.config.prompt = proc do |obj, level, _| | |
prompt = "\e[1;30m" | |
prompt << "#{Rails.version} @ " if defined?(Rails) | |
prompt << "#{RUBY_VERSION}" | |
"#{prompt} (#{obj})>\e[0m" | |
end |
#!/usr/bin/env ruby | |
# | |
# Convert blogger (blogspot) posts to jekyll posts | |
# | |
# Basic Usage | |
# ----------- | |
# | |
# ./blogger_to_jekyll.rb feed_url | |
# | |
# where `feed_url` can have the following format: |
require 'matrix' | |
def regression x, y, degree | |
x_data = x.map {|xi| (0..degree).map{|pow| (xi**pow) }} | |
mx = Matrix[*x_data] | |
my = Matrix.column_vector y | |
((mx.t * mx).inv * mx.t * my).transpose.to_a[0].reverse | |
end |