mberlanda

require 'rails_helper'
require 'representable/json'
require 'representable/json/collection'

class Song < OpenStruct
end

# Ex. 1 using standalone collections
class SongRepresenter < Representable::Decorator
  include Representable::JSON

mberlanda

# source: https://rosettacode.org/wiki/Sorting_algorithms/Quicksort#Ruby
class Array
  def quick_sort
    h, *t = self
    h ? t.partition { |e| e < h }.inject { |l, r| l.quick_sort + [h] + r.quick_sort } : []
  end
end

mberlanda

# https://it.wikipedia.org/wiki/Partita_IVA#Struttura_della_partita_IVA
module ChecksumCalculation 
  def calculate(ary)
    (10 - t(ary)) % 10
  end
 
  private

  def t(ary)
    odd, even = separate_odd_even(ary)

mberlanda

class NewtonsMethod
  def initialize(f_proc, f_prime_proc)
    @fp = f_proc
    @fpp = f_prime_proc
  end

  def apply(x)
    x - (@fp.call(x) / (@fpp.call(x) * 1.0))
  end

mberlanda

# https://en.wikipedia.org/wiki/Riemann_sum
class RiemannSum

  def initialize(f, v_start, v_end, n_step)
    @f = f
    @v_start = v_start
    @v_end = v_end
    @n_step = n_step
    @step_size = (v_end - v_start) / (n_step * 1.0)
  end

mberlanda

#!/usr/bin/perl

use strict;
use warnings;
use 5.014;

=head1 NAME

Rails Assets Coverage

mberlanda

require 'bundler'

lockfile = Bundler::LockfileParser.new(Bundler.read_file('Gemfile.lock'))

specs = lockfile.specs
gems_hash = Hash.new.tap do |h|
  specs.each do |s|
    h[s.name] = {
      spec: s,
      dependencies: s.dependencies.map(&:name)

mberlanda

Keybase proof

I hereby claim:

• I am mberlanda on github.
• I am mberlanda (https://keybase.io/mberlanda) on keybase.
• I have a public key ASAmHgHzX-F6f6Q2QgGnrbqQLRJfeaXgCw54YdMeRyJuQwo

To claim this, I am signing this object:

mberlanda

Multiple gem versions

While developing a serialization gem I needed to compare my current code with previous gem versions.

(Un)fortunately bundler does not allow to install several versions of the same gem to prevent conflicts on class names. The purpose of this script is to wrap a gem into a namespace/module named.

You should set in the main script:

• L7 TARGET_DIR: the dir where the gems will be extracted
• L8 PKG_DIR : the dir where the .gem files will be downloaded

mberlanda

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

PROJECT_DIR=$(git rev-parse --show-toplevel)

# Base branch for rebasing
BASE_BRANCH="master"

# Enter here the name of the branches to rebase