Here is a talk Uncle Bob gave in 2011 at Ruby Midwest 2011. Honestly, I come back to this talk every two months or so. I must also add that I’m a great fan of Uncle Bob (@unclebobmartin). It also contains some notes about MVC - what the true purpose of MVC is, why it was created and so on. Here it is (you need to click on Read more to load the embedded YouTube video):

Have a great day

Swedish House Mafia - Greyhound on Vimeo.

–robert

Let’s write it down.

To be honest, I don’t remember when I actually started thinking about writing down most of the solutions I found on the internet or implemented myself. I realized that from time to time I go back to solutions, code snippets or config files I created or modified to fulfill some specific requirements. It’s good if I wrote it down somewhere, put it on Gist or Pastebin, but what if I did not? Let’s say I just configured Nginx as a load balancer and, for example, after a year or so I need to make something exactly the same or at least similar. What then? I need to go through the Nginx documentation again or start searching on Google. Sure, in some cases I remember exactly how I solved a specific problem, but when it was some time ago then… This is the reason why I decided to create this simple blog. I hope it won’t evolve in any unpredictable way. You can think about this blog as my notebook. If somebody else finds my notes useful/helpful - even better. Let’s make this World better.

Have a great day.

P.S. As you probably noticed, I’m not a native speaker, so in case you find some mistakes in my posts (probably more than one), please let me know ASAP.

Our universe (in SI units):

\(\begin{align*} & \phi(x,y) = \phi \left(\sum_{i=1}^n x_ie_i, \sum_{j=1}^n y_je_j \right) = \sum_{i=1}^n \sum_{j=1}^n x_i y_j \phi(e_i, e_j) = \\ & (x_1, \ldots, x_n) \left( \begin{array}{ccc} \phi(e_1, e_1) & \cdots & \phi(e_1, e_n) \\ \vdots & \ddots & \vdots \\ \phi(e_n, e_1) & \cdots & \phi(e_n, e_n) \end{array} \right) \left( \begin{array}{c} y_1 \\ \vdots \\ y_n \end{array} \right) \end{align*}\)

def show
  @widget = Widget(params[:id])
  respond_to do |format|
    format.html # show.html.erb
    format.json { render json: @widget }
  end
end

package interfaces
import (
	"io"
	"os"
)

//PipeExample function
func PipeExample() error {
	r, w := io.Pipe()

	go func() {
		w.Write([]byte("test\n"))
		w.Close()
	}()

	if _, err := io.Copy(os.Stdout, r); err != nil {
		return err
	}
	return nil
}

package interfaces

import (
	"fmt"
	"io"
	"os"
)

// Copy data from std in to std out
func Copy(in io.ReadSeeker, out io.Writer) error {
	w := io.MultiWriter(out, os.Stdout)
	if _, err := io.Copy(w, in); err != nil {
		return err
	}
	in.Seek(0, 0)
	buf := make([]byte, 64)
	if _, err := io.CopyBuffer(w, in, buf); err != nil {
		return err
	}

	fmt.Println()
	return nil
}

–robert