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@aspyct
aspyct / sort.rb
Last active October 29, 2023 03:08
Ruby implementation of quicksort, mergesort and binary search
# Sample implementation of quicksort and mergesort in ruby
# Both algorithm sort in O(n * lg(n)) time
# Quicksort works inplace, where mergesort works in a new array
def quicksort(array, from=0, to=nil)
if to == nil
# Sort the whole array, by default
to = array.count - 1
end
@mildmojo
mildmojo / left_join_arel_example.rb
Last active April 5, 2024 16:00
LEFT JOIN in ARel for ActiveRecord in Ruby on Rails
# Here's a contrived example of a LEFT JOIN using ARel. This is an example of
# the mechanics, not a real-world use case.
# NOTE: In the gist comments, @ozydingo linked their general-purpose ActiveRecord
# extension that works for any named association. That's what I really wanted!
# Go use that! Go: https://gist.github.com/ozydingo/70de96ad57ab69003446
# == DEFINITIONS
# - A Taxi is a car for hire. A taxi has_many :passengers.
# - A Passenger records one person riding in one taxi one time. It belongs_to :taxi.
@stereoscott
stereoscott / active_admin.rb
Last active March 15, 2020 10:47
Stream CSV exports in ActiveAdmin in Rails 4
# if you want to monkey patch every controller, put this in initializers/active_admin.rb
ActiveAdmin::ResourceController.class_eval do
include ActiveAdmin::CSVStream
end
@odlp
odlp / bundler-rspec-inline.rb
Created August 9, 2018 09:43
Inline Bundler and autorun RSpec
require "bundler/inline"
gemfile do
gem "rspec"
end
require "rspec/autorun"
RSpec.describe "inline Bundler and autorun RSpec" do
it "is convenient for self-contained examples & bug repros" do