All Questions

I have a system that handles many types of worker roles (around 30) in the company where I work. They all have data in common (such as personal data). What I would like to make more efficient is to reuse method code for many types of workers. Some of the classes are: Manager, Directorand Employeeeach one must check its input time and I do that with another class called Company, so I have three methods for the class:

public class Company
{
    public void CheckIn(Director Person)
    {

    }

    public void CheckIn(Employee Person)
    {

    }

    public void CheckIn(Manager Person)
    {

    }
}

Depending on the role that enters the company, different things happen at the entrances to the entire building. I hope I made myself understood.

Assuming I have the following array of objects:

    var travelers = [
         {
           "name":"ana",
           "lastname":"gomez"
         },
         {
           "name":"juan",
           "lastname":"gomez"
         },
         {
           "name":"luis",
           "lastname":"gomez"
         },
         {
           "name":"pedro",
           "lastname":"gomez"
         }
    ];

I would like to know if there is a way to remove an object from the array in pure JavaScript or jQuery , by entering the position of the object to be removed.

R's graph generation system ggplot2is surprisingly versatile, but I haven't found a way to generate a waterfall chart similar to this:

How can I, using ggplot2, generate this kind of chart?

Sample data (similar to the graph shown:

df <- data.frame(
  montos = c(420, 210, -170, -140),
  row.names = c('Ingresos', 'Otros ingresos', 'Costos fijos', 'Costos variables')
)
df
##                  montos
## Ingresos            420
## Otros ingresos      210
## Costos fijos       -170
## Costos variables   -140

For some time now, two terms have been appearing on some blogs that I don't quite understand: Rvalueand Lvalue. Without being clear about the meaning of both terms, the content of certain examples becomes complicated to understand.

1. What differences are there between a Rvalueand a Lvalue?
2. How can each be identified?
3. What can and cannot be done with each of them?

To initialize some variables in a Python program (in a structured way, without using OOP), I want to use a function called initialization() , which is called from a main() function . The problem is the scope of these variables, since if I give them their initial value in the initialization() function , trying to use them in the main() function will generate an error because they do not exist there. For example:

import serial

def inicializacion():
    puerto = '/dev/ttyACM0'
    baudRate = 115200
    buffer = ''
    ser = serial.Serial(puerto, baudRate, timeout=1)


def main():
    inicializacion()
    buffer = buffer + leerDatos(ser)

What alternatives are there to avoid using "global" in the initialization function? Is it possible to implement any solution without having to pass the variables as arguments and without having to return them on the "return"?