C0D3BREAK3R's questions

I have the following code:

function accum(s) {
    let resultado = "";
    let cadenaAgregar = "";

    s.split("").forEach((item, i) => {
        cadenaAgregar += item.repeat(i + 1);
        cadenaAgregar[0].toUpperCase();
        resultado += cadenaAgregar;
        cadenaAgregar = "";
    });

    return resultado;
}

console.log(accum("abcd"));

Before the string is added to the 'result' variable the first letter is supposed to be converted to uppercase but this doesn't work, I'd appreciate knowing why this is happening and what I should do

I have the following HTML structure:

<main class="video">

    <div class="video__contenedor">

        <div class="video__descripcion">
            <div id="video__descripcion__contenido">Descripcion</div>
            <button class="video__descripcion__boton">Ver Más Información</button>

        </div>

        <div class="video__contenido">

            <iframe src="https://player.vimeo.com/video/88509099" width="640" height="480" allow="autoplay; fullscreen; picture-in-picture" allowfullscreen></iframe>

        </div>

    </div>

</main>

The CSS code that belongs to each wrapper class is as follows:

.video {
    display        : flex;
    justify-content: center;
    font-family    : Montserrat;
}

.video__contenedor {
    width           : 80%;
    background-color: #158eff;
    padding         : 15px;
    border-radius   : 10px;
    color           : white;
    margin-top      : 20px;
    font-size       : 18px;
}

.video__contenido {
    margin-top: 20px;
}

iframe {
    width: 100%;
}

The way I get the Vimeo iframe to width: 100%stay in my container is with , but this leaves me with a few spaces on the sides or top and bottom (depending on the width of the screen) which I marked with red rectangles on the image, I can't remove these spaces despite having tried different CSS properties. Does anyone know if this is possible and if so what I should do? Thanks in advance

I have the problem of wanting to make PHP receive all the files that were selected in the different file inputs that are generated dynamically with JavaScript. I would like to know if there is a way to send multiple files of different inputs to PHP via AJAX and then treat each file in PHP in some way.

What I have tried is the following:

HTML

<div class="contenedor__examen">

            <div class="contenedor__examen__seccion">
                <p>Nombre de la Pregunta</p>
                <input type="text" class="inputTexto nombrePregunta">

                <p>Respuesta Correcta</p>
                <input type="text" class="inputTexto respuestaCorrecta">

                <div class="contenedor__audio">

                    <input type="file" id="real-file" hidden="hidden" name="audio" class="botonAudio">
                    <button type="button" id="custom-button" class="botonInput" numinput="1">Subir Audio</button>
                    <br>
                    <span id="custom-text" class="textoInput">Ningún audio seleccionado</span>

                </div>

                <p>Texto al Reproducir</p>
                <input type="text" class="inputTexto inputFinal textoAlReproducir">
            </div>

        </div>

The code block above is generated multiple times with a few differences added through JS.

JS

valoresAudios = [];

obtenerAudios = () => {
    valoresAudios = [];
    let audios = document.querySelectorAll(".botonAudio");
    audios.forEach((_elemento, indice) => {
        valor = audios[indice];

        valoresAudios.push(valor);
    });
};

btnEnviarExamen.addEventListener("click", (e) => {
    e.preventDefault();
    let nombreDelExamen = nombreExamen.value;
    let temarioAlQuePertenece = valueSelect;

    let enviarExamen = new FormData();
    enviarExamen.append("nombreExamen", nombreDelExamen);
    enviarExamen.append("temarioAlQuePertenece", temarioAlQuePertenece);

    enviarExamen.append(
        "valorNombrePreguntas",
        JSON.stringify(valoresNombresPreguntas)
    );

    enviarExamen.append(
        "valoresRespuestasCorrectas",
        JSON.stringify(valoresRespuestasCorrectas)
    );

    enviarExamen.append("valoresAudios", valoresAudios);

    enviarExamen.append(
        "revaloresTextoAlReproducirspuestas",
        JSON.stringify(valoresTextoAlReproducir)
    );

    xhr = new XMLHttpRequest();
    xhr.open("POST", "/src/admin/examenes/subirExamen.php", true);

    xhr.onload = function () {
        if (this.status === 200) {
            console.log(this.responseText);
        }
    };

    xhr.send(enviarExamen);
});

There is more JS code but I don't think it's relevant, my problem is to send all the file inputs via AJAX to PHP in order to upload them to the server and store their location in MYSQL.

PHP

<?php

session_start();

require_once($_SERVER["DOCUMENT_ROOT"] . "/src/admin/comprobarAdmin.php");
require_once($_SERVER["DOCUMENT_ROOT"] . "/src/conexionbd.php");

$valoresAudio = $_POST["valoresAudios"];

for ($i = 0; $i < count($valoresAudio); $i++)
{
    var_dump($_FILES["audio"]['name']);
}

Any help or suggestion is welcome. Thanks in advance.

I've tried all the ways I've found, I've seen several questions on Stack Overflow and searched the web but I can't get JavaScript to receive the data in a way that it can handle it. I'm getting a MySQL query in AJAX but it's like JavaScript treats it as plain text. I leave the codes:

javascript

/*=============================================
=                 Obtener Tests               =
=============================================*/

const select = document.getElementById("seleccionarTemario");

select.addEventListener("change", () => {
    let opcionSeleccionada = select.options[select.selectedIndex];
    let idTemarioSeleccionado = opcionSeleccionada.value;
    valueSelect = idTemarioSeleccionado;

    console.log(idTemarioSeleccionado);

    ajaxObtenerTests(valueSelect);
});

/*============  End of Obtener Tests  =============*/

/*=============================================
=              AJAX Obtener Tests             =
=============================================*/

let datosObtenidos;

ajaxObtenerTests = (idTemario) => {
    let peticion = new FormData();
    peticion.append("idTemario", idTemario);

    let xhr = new XMLHttpRequest();

    xhr.open("POST", "/src/admin/test/obtenerTests.php", true);

    xhr.onload = function () {
        if (this.status === 200) {
            let datos = this.responseText;
            datosObtenidos = datos;
            verDatos();
        }
    };

    xhr.send(peticion);
};

verDatos = () => {
    console.log(datosObtenidos);
    console.log(datosObtenidos[0].id_test);
};

PHP

<?php

session_start();

require_once($_SERVER["DOCUMENT_ROOT"] . "/src/admin/comprobarAdmin.php");
require_once($_SERVER["DOCUMENT_ROOT"] . "/src/conexionbd.php");

$idTemario = $_POST["idTemario"];

$sqlObtenerTests = "SELECT id_test, nombre_test, ruta_test FROM tests WHERE temario_perteneciente = $idTemario";
$obtenerTests = mysqli_query($conn, $sqlObtenerTests);

$datosTests = [];

while ($row = mysqli_fetch_array($obtenerTests))
{
    array_push($datosTests, $row);
}

echo json_encode($datosTests);

The data I receive in JS is this:

[{"id_test":"18","nombre_test":"Test","ruta_test":"C:\/xampp\/htdocs\/1PHP\/pages\/contenido temarios\/tests\/Test.php"},{"id_test":"19","nombre_test":"Test 2","ruta_test":"C:\/xampp\/htdocs\/1PHP\/pages\/contenido temarios\/tests\/Test 2.php"}] <script data-prepros-origin-host="localhost" src="http://localhost:300/__prepros-server__/prepros.js"> </script>

It seems to me that something that may be giving me an error is that this string is added to the end of the json text:

<script data-prepros-origin-host="localhost" src="http://localhost:300/__prepros-server__/prepros.js"> </script>

And I don't understand why that is added. I think it shouldn't happen.

I have eliminated the chain that I mentioned before but still I am still unable to process the response received, I add code where the change made is shown:

xhr.onload = function () {
        if (this.status === 200) {
            let cadena =
                ' <script data-prepros-origin-host="localhost" src="http://localhost:300/__prepros-server__/prepros.js"> </script>';
            let datos = this.responseText.replace(cadena, "");
            datosObtenidos = datos;
            verDatos();
        }
    };

After that modification I get the following in the console.log to see the data of the variable datosObtenidos:

[{"id_test":"18","nombre_test":"Test","ruta_test":"C:\/xampp\/htdocs\/1PHP\/pages\/contenido temarios\/tests\/Test.php"},{"id_test":"19","nombre_test":"Test 2","ruta_test":"C:\/xampp\/htdocs\/1PHP\/pages\/contenido temarios\/tests\/Test 2.php"}]

Still as shown in the final console.log I can't access the values.

I want to treat the data in JS as an array or in any way that allows me to iterate through the values. If someone knows how to avoid sending me the indices 0,1 and 2, getting the indices to be only those with names, I would appreciate it.

If there is any other easier way to get the expected result and any suggestion is welcome. Thanks in advance.

I have a kind of form where questions and answers are added for a test, all my functions perform their task according to my expectations except one of them which is called several times each time a button is pressed (it was the solution I found so that when new elements are created in the DOM loop back through the new elements)

The function adds new possible answers to the DOM but the problem I have is that as new question fields are created, the elements that are left behind repeat the function more than necessary. For example, I have 3 question fields, if I add 1 new answer to the last field an answer is inserted (as it should be) but in the second the answer is inserted 2 times and in the first 3 times, I suppose this has to do with the fact that I call the function that checks the click on the different elements every time a new question field is inserted.

Curiously, other functions that I call every time a new question field is created do not execute their functionality more times than expected, it only happens to me with the function to add answers. If you have not understood me, ask me.

I share code below:

HTML and PHP

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="/css/admin/tests/crearTest.css">
</head>

<body>

    <main class="test">
        <div class="contenedor">

            <div class="contenedor__nombre">
                <p>Nombre del Test</p>
                <input type="text" name="nombreTest" id="nombreTest" class="inputTexto">
            </div>

            <div class="contenedor__temarioPerteneciente">

                <p>Seleccione Temario al que Pertenece</p>
                <select name="temarioPerteneciente" id="temarioPerteneciente">
                    <option value="">Ninguna Opción Seleccionada</option>
                    <?php
                    while ($row = mysqli_fetch_array($consultarTemarios))
                    {
                        $id = $row['id_temario'];
                        $nombre = $row['nombre_temario'];

                        echo '<option value="' . $id . '">' . $nombre . '</option>';
                    }
                    ?>
                </select>

            </div>


        </div>

    </main>

    <div id="contenedorVistasPrevias">

        <div class="vistaPrevia" id="vistaPrevia-1" numvistaprevia="1">

            <div class="vistaPrevia__pregunta">
                <p>Nombre de la Pregunta</p>
                <input type="text" name="" id="nombrePregunta-1" class="inputTexto textoPregunta">

                <p>Añadir Respuesta</p>
                <input type="text" name="" id="añadirRespuesta-1" class="inputTexto textoRespuesta">
                <button class="vistaPrevia__pregunta__boton botonDesactivado btnAñadir" id="btnAñadirRespuesta-1">Añadir</button>
                <p>Escoja la respuesta correcta</p>
            </div>

            <div class="vistaPrevia__respuestas">
                <div class="vistaPrevia__respuestas__radio radioRespuestas" id="vistaPreviaRespuestasRadio-1">
                </div>

            </div>

        </div>

    </div>



    <div class="contenedorEnviarTest">
        <button class="agregarPregunta botonDesactivado" id="btnAgregarPregunta">Agregar Pregunta</button>
    </div>

    <div class="contenedorEnviarTest">
        <button class="enviarTest botonDesactivado" id="btnEnviarTest">Enviar Test</button>
    </div>

    <script src="/js/admin/test/peticionTest.js"></script>

</body>

</html>

javascript

/*=============================================
=         Validar Agregar Pregunta            =
=============================================*/

let nombreTest = document.getElementById("nombreTest");
let select = document.getElementById("temarioPerteneciente");
const btnAgregarPregunta = document.getElementById("btnAgregarPregunta");

let valueSelect = "";

if (nombreTest.textContent === "") {
    btnAgregarPregunta.disabled = true;
}

select.addEventListener("change", () => {
    let opcionSeleccionada = select.options[select.selectedIndex];
    let idTemarioSeleccionado = opcionSeleccionada.value;
    valueSelect = idTemarioSeleccionado;

    // idTemarioCorrespondiente.value = idTemarioSeleccionado;

    console.log(idTemarioSeleccionado);

    if (nombreTest.value !== "" && valueSelect !== "") {
        btnAgregarPregunta.disabled = false;
        btnAgregarPregunta.classList.remove("botonDesactivado");
    } else {
        btnAgregarPregunta.disabled = true;
        btnAgregarPregunta.classList.add("botonDesactivado");
    }
    validarTestCompleto();
});

nombreTest.onkeyup = () => {
    if (nombreTest.value !== "" && valueSelect !== "") {
        btnAgregarPregunta.disabled = false;
        btnAgregarPregunta.classList.remove("botonDesactivado");
    } else {
        btnAgregarPregunta.disabled = true;
        btnAgregarPregunta.classList.add("botonDesactivado");
    }
    validarTestCompleto();
};

/*============  End of Validar Agregar Pregunta  =============*/

/*=============================================
=          Validar Añadir Respuesta           =
=============================================*/

validarAñadirRespuesta = () => {
    let añadirRespuesta = document.querySelectorAll(".textoRespuesta");
    let nombrePregunta = document.querySelectorAll(".textoPregunta");
    let btnAñadir = document.querySelectorAll(".btnAñadir");

    añadirRespuesta.forEach((elementoActual, indice) => {
        elementoActual.onkeyup = function () {
            if (
                añadirRespuesta[indice].value !== "" &&
                nombrePregunta[indice].value !== ""
            ) {
                btnAñadir[indice].disabled = false;
                btnAñadir[indice].classList.remove("botonDesactivado");
            } else {
                btnAñadir[indice].disabled = true;
                btnAñadir[indice].classList.add("botonDesactivado");
            }
            validarTestCompleto();
        };
    });

    nombrePregunta.forEach((elementoActual, indice) => {
        elementoActual.onkeyup = function () {
            if (
                añadirRespuesta[indice].value !== "" &&
                nombrePregunta[indice].value !== ""
            ) {
                btnAñadir[indice].disabled = false;
                btnAñadir[indice].classList.remove("botonDesactivado");
            } else {
                btnAñadir[indice].disabled = true;
                btnAñadir[indice].classList.add("botonDesactivado");
            }
            validarTestCompleto();
        };
    });
};

validarAñadirRespuesta();

/*============  End of Validar Añadir Respuesta  =============*/

/*=============================================
=               Añadir Respuesta              =
=============================================*/
let numRadioLabel = 1;

añadiendoRespuesta = (indice) => {
    let añadirRespuesta = document.querySelectorAll(".textoRespuesta");
    let radioRespuestas = document.querySelectorAll(".radioRespuestas");

    let radioRespuesta = `
            <div class="vistaPrevia__respuestas__radio__elemento" numrespuesta="${numRadioLabel}">
                <div class="vistaPrevia__respuestas__radio__elemento__contenedor">
                    <div class="radio-block">
                        <div class="radio-content">
                            <input id="radio${numRadioLabel}" type="radio" name="radio-${
        indice + 1
    }" class="radio"/>
                            <label for="radio${numRadioLabel}" class="respuesta"><span></span></label>
                            <p class="respuesta">${
                                añadirRespuesta[indice].value
                            }</p>
                        </div>
                    </div>

                </div>
                <div class="eliminarRespuesta">
                    <button class="eliminarRespuesta__botón" numrespuesta="${numRadioLabel}" >Eliminar</button>
                </div>
            </div>

            `;

    radioRespuestas[indice].insertAdjacentHTML("beforeend", radioRespuesta);

    numRadioLabel++;
    botonesRadio();
    botonesEliminarRespuesta();
    console.log("añadiendi");
};

añadirRespuesta = () => {
    btnAñadirRespuesta = document.querySelectorAll(".btnAñadir");

    btnAñadirRespuesta.forEach((botonActual, indice) => {
        botonActual.addEventListener("click", () => {
            añadiendoRespuesta(indice);
        });
    });
};

añadirRespuesta();
/*============  End of Añadir Respuesta  =============*/

/*=============================================
=              Agregar Pregunta               =
=============================================*/

var numID = 2;

btnAgregarPregunta.addEventListener("click", () => {
    let contenedorVistasPrevias = document.getElementById(
        "contenedorVistasPrevias"
    );

    let nuevaPregunta = `

<div class="vistaPrevia" id="vistaPrevia-${numID}" numvistaprevia="${numID}">

    <div class="vistaPrevia__pregunta">
        <p>Nombre de la Pregunta</p>
        <input type="text" name="" id="nombrePregunta-${numID}" class="inputTexto textoPregunta">

        <p>Añadir Respuesta</p>
        <input type="text" name="" id="añadirRespuesta-${numID}" class="inputTexto textoRespuesta">
        <button class="vistaPrevia__pregunta__boton botonDesactivado btnAñadir" id="btnAñadirRespuesta-1">Añadir</button>
        <p>Escoja la respuesta correcta</p>
    </div>

    <div class="vistaPrevia__respuestas">
        <div class="vistaPrevia__respuestas__radio radioRespuestas" id="vistaPreviaRespuestasRadio-${numID}">

        </div>
    </div>

    <div class="eliminarPregunta">
        <button class="eliminarPregunta__botón" numvistaprevia="${numID}">Eliminar Pregunta</button>
    </div>

</div>

`;
    contenedorVistasPrevias.insertAdjacentHTML("beforeend", nuevaPregunta);

    numID++;

    validarAñadirRespuesta();
    añadirRespuesta();
    validarTestCompleto();
    botonesEliminarPregunta();
});

/*============  End of Agregar Pregunta  =============*/

/*=============================================
=                 Validar Test                =
=============================================*/

let botonAgregarPregunta = document.getElementById("btnAgregarPregunta");
const btnEnviarTest = document.getElementById("btnEnviarTest");

validarAgregarPregunta = () => {
    if (botonAgregarPregunta.classList.contains("botonDesactivado")) {
        botonAgregarPreguntaValido--;
    } else {
        botonAgregarPreguntaValido++;
    }
};

validarTestCompleto = () => {
    let botonesRadio = document.querySelectorAll(".radio");
    let botonesAñadir = document.querySelectorAll(".btnAñadir");

    botonesRadioActivos = 0;
    botonesAñadirValidos = 0;
    botonAgregarPreguntaValido = 0;

    for (let i = 0; i < botonesRadio.length; i++) {
        if (botonesRadio[i].checked === true) {
            botonesRadioActivos++;
        } else {
        }
    }

    for (let i = 0; i < botonesAñadir.length; i++) {
        if (botonesAñadir[i].classList.contains("botonDesactivado")) {
            botonesAñadirValidos--;
        } else {
            botonesAñadirValidos++;
        }
    }

    validarAgregarPregunta();

    if (
        botonesRadioActivos === numID - 1 &&
        botonesAñadirValidos === numID - 1 &&
        botonAgregarPreguntaValido > 0
    ) {
        btnEnviarTest.classList.remove("botonDesactivado");
        btnEnviarTest.disabled = false;
    } else {
        btnEnviarTest.classList.add("botonDesactivado");
        btnEnviarTest.disabled = true;
    }
};

botonesRadio = () => {
    let botonesRadio = document.querySelectorAll(".radio");
    botonesRadio.forEach((botonRadio) => {
        botonRadio.addEventListener("click", () => {
            validarTestCompleto();
        });
    });
};

btnEnviarTest.disabled = true;

/*============  End of Validar Test  =============*/

/*=============================================
=                 Enviar Datos                =
=============================================*/

respuestasCorrectas = [];

obtenerRespuestasCorrectas = () => {
    let botonesRadio = document.querySelectorAll(".radio");

    for (let i = 0; i < botonesRadio.length; i++) {
        if (botonesRadio[i].checked === true) {
            respuestasCorrectas.push(
                botonesRadio[i].nextElementSibling.nextElementSibling.innerHTML
            );
            console.log(respuestasCorrectas);
        }
    }
};

/* End of Subsection
-------------------------------------------------- */

valorNombrePreguntas = [];

obtenerNombrePreguntas = () => {
    let nombrePregunta = document.querySelectorAll(".textoPregunta");

    for (let i = 0; i < nombrePregunta.length; i++) {
        valorNombrePreguntas.push(nombrePregunta[i].value);
        console.log(valorNombrePreguntas);
    }
};

/* End of Subsection
-------------------------------------------------- */

btnEnviarTest.addEventListener("click", () => {
    let nombreDelTest = nombreTest.value;
    let temarioAlQuePertenece = valueSelect;

    obtenerRespuestasCorrectas();
    obtenerNombrePreguntas();

    let enviarTest = new FormData();
    enviarTest.append("nombreDelTest", nombreDelTest);
    enviarTest.append("temarioAlQuePertenece", temarioAlQuePertenece);
    enviarTest.append(
        "valorNombrePreguntas",
        JSON.stringify(valorNombrePreguntas)
    );
    enviarTest.append(
        "respuestasCorrectas",
        JSON.stringify(respuestasCorrectas)
    );

    console.log(`respuestas correctas ${respuestasCorrectas}`);

    xhr = new XMLHttpRequest();
    xhr.open("POST", "/src/admin/test/subirTest.php", true);

    xhr.onload = function () {
        if (this.status === 200) {
            console.log("exito");
        }
    };

    xhr.send(enviarTest);
});

/*============  End of Enviar Datos  =============*/

/*=============================================
=             Eliminar Pregunta               =
=============================================*/

eliminarPregunta = (numVistaPrevia) => {
    console.log("click");
    let vistaPrevias = document.querySelectorAll(".vistaPrevia");

    numVistaPrevia = numVistaPrevia;
    for (let i = 0; i < vistaPrevias.length; i++) {
        if (vistaPrevias[i].getAttribute("numVistaPrevia") === numVistaPrevia) {
            vistaPrevias[i].remove();
            numID--;
            validarTestCompleto();
        }
    }
};

botonesEliminarPregunta = () => {
    let eliminarPreguntaBtn = document.querySelectorAll(
        ".eliminarPregunta__botón"
    );
    eliminarPreguntaBtn.forEach((elemento) => {
        elemento.addEventListener("click", () => {
            numVistaPrevia = elemento.getAttribute("numVistaPrevia");
            eliminarPregunta(numVistaPrevia);
            console.log(numVistaPrevia);
        });
    });
};

botonesEliminarPregunta();

/*============  End of Eliminar Pregunta  =============*/

/*=============================================
=             Eliminar Respuesta              =
=============================================*/

eliminarRespuesta = (numRespuesta) => {
    console.log("click");
    let elementosRadio = document.querySelectorAll(
        ".vistaPrevia__respuestas__radio__elemento"
    );

    numRespuesta = numRespuesta;
    for (let i = 0; i < elementosRadio.length; i++) {
        if (elementosRadio[i].getAttribute("numrespuesta") === numRespuesta) {
            elementosRadio[i].remove();
            validarTestCompleto();
        }
    }
};

botonesEliminarRespuesta = () => {
    let eliminarRespuestaBtn = document.querySelectorAll(
        ".eliminarRespuesta__botón"
    );
    eliminarRespuestaBtn.forEach((elemento) => {
        elemento.addEventListener("click", () => {
            numRespuesta = elemento.getAttribute("numrespuesta");
            eliminarRespuesta(numRespuesta);
            console.log(numRespuesta);
        });
    });
};

/*============  End of Eliminar Respuesta  =============*/

The section of the function to add questions is where I have the problem, the rest of the functions are executed as expected. I appreciate any help or suggestion.

If anyone knows how to execute a function on existing and dynamically created elements without giving me that error mentioned above I would appreciate it.

Thanks in advance.

I would like to know why part of this code works by doing what I hope is counting the number of times the part that calculates persistence is executed in the if (I am not sure if it is called that in Spanish or is the term real):

let contar = 0;

persistence = (param) => {
    contar = 0;

    if (param !== undefined && param > 0) {
        let num = param;

        let numString = num.toString();

        let arreglo = numString.split("");
        let arregloNum = arreglo.map(Number);

        if (arregloNum.length >= 2) {
            let calc = arregloNum.reduce((p, c) => p * c);
            persistence(calc);
            contar++;
            console.log(calc);
            return contar;
        } else {
            return 0;
        }
    } else {
        return false;
    }
};

console.log(persistence(39));
console.log(persistence(4));
console.log(persistence(25));
console.log(persistence(999));

But if I put contar++before persistence(calc);the counter it stays at 0. Here the code how it doesn't work correctly:

let contar = 0;

persistence = (param) => {
    contar = 0;

    if (param !== undefined && param > 0) {
        let num = param;

        let numString = num.toString();

        let arreglo = numString.split("");
        let arregloNum = arreglo.map(Number);

        if (arregloNum.length >= 2) {
            let calc = arregloNum.reduce((p, c) => p * c);
            contar++;
            persistence(calc);
            console.log(calc);
            return contar;
        } else {
            return 0;
        }
    } else {
        return false;
    }
};

console.log(persistence(39));
console.log(persistence(4));
console.log(persistence(25));
console.log(persistence(999));

Can someone explain to me what is causing this? Thank you

I would like to know if it is possible to obtain this result:

Subtraction of 5-1 equals 4

I know if I do this I can get it:

$numero = 5;
$numero2 = 1;

$resultado = $numero - $numero2;

echo "La resta de 5-1 es igual a $resultado";

But I want to get that result by doing something like this (I know it's wrong but it's so you understand me)

$numero =5;

echo "La resta de 5-1 es igual a $numero-1";

I would like to know if it is possible to do something like that.

Also know if it is possible to perform a subtraction of numbers in the string in a similar way as I expressed it before, for example:

echo "La resta de 5-1 es igual a 5-1(y que me de 4)";

It is a curiosity that I had.

Thanks in advance

First of all I want to clarify that I am from Cuba and here the internet is super expensive, costing $1 per hour and that is why I am asking this question. I know that node packages are usually installed very easily by their respective commands and everything works very well and great but you have to have an internet connection.

I would like to know, please, if someone knows how to download the node packages so that I can install them without an internet connection on my computer It should be noted that the computer on which I write is not my personal PC so I need to be able to download them for later and install them without internet connection. I am using a proxy for internet connection.

I would be very grateful if someone helps me and explains step by step how to make this possible, you can't imagine how much I would appreciate it. Thank you very much in advance.