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Martin Hope
Codelaby
Asked: 2020-01-29 11:23:32 +0800 CST
  • 15

I am about to start an Android application, I want to release two versions, one lite and one pro .

The two versions will have shared code and depending on whether it is the pro version, it will have extra options.

More or less I have read something about what to do with flavors but I am very new to the world of Android development.

java
Martin Hope
Chofoteddy
Asked: 2020-12-30 09:58:01 +0800 CST
  • 15

Reading the MDN documentation where the primitive data is talked about, no matter Symbolhow much I read and reread, I don't understand what would be a use case for said element other than to iterate Symbol.iterator.

The documentation says that its use is for debugging purposes , but even with that I don't understand why use a to debug if or Symbolexists .console.log()debugger

I understand that it is a primitive data and therefore immutable. In the examples I have seen that they do something like the following:

var sym = Symbol('Llave'),
    obj = {
        [sym]: 'valor'
    };

console.log(obj[sym]); // valor
console.log(obj['Llave']); // undefined

Why use a Symbol? if a traditional key (key: value) can be used.

Sources:

javascript
Martin Hope
kamome
Asked: 2020-12-18 23:55:50 +0800 CST
  • 15

I have a Python program that reads a text file (.txt) and with a series of data from the file, generates a PDF with certain information. To read the .txt use regular expressions. In Javascript there is no problem, I can do it in a similar way to Python, but I can't find any library that generates a PDF so that it can be downloaded by the user from the web.

Does anyone know if there is a Javascript library to generate a downloadable PDF?

javascript
Martin Hope
Chofoteddy
Asked: 2020-12-15 17:14:10 +0800 CST
  • 15

It turns out that following the documentation of the fancybox library, I find that to define the behavior of its elements through classes, a syntax like the following must be followed:

<a href="http://www.dominio-ejemplo.mx/pagina" class="fancybox.iframe">
    <!-- Código HTML -->
</a>

I want to add " x " behaviors via jQuery to such elements, but I find myself still escaping the "." (dot) with the backslash () does not take the element.

I leave the following snippet:

$(function(){
  $('button').on('click', function(){
    /* No funciona */
    $('.fancybox\.image').remove();
  });
});
.fancybox\.iframe {
  color: white;
  background-color: red;
}

.fancybox\.image {
  color: white;
  background-color: green;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<ul>
  <li>
    <a href="http://www.dominio-ejemplo.mx/pagina" class="fancybox.iframe">Estilo iframe</a>
  </li>
  <li>
    <a href="http://www.dominio-ejemplo.mx/pagina" class="fancybox.image">Estilo imagen</a>
  </li>
</ul>

<button>Borrar: fancybox.iframe</button>

javascript
Martin Hope
Angel Angel
Asked: 2020-11-05 16:26:45 +0800 CST
  • 15

I was practicing with lambdas and came across the following code:

auto make_fibo() {
    return [](int n) {
        std::function<int(int)> recurse;

        recurse = [&](int n) {
            return (n <= 2) ? 1 : recurse(n - 1) + recurse(n - 2);
        };

        return recurse(n);
    };
}

I did not know what it was functionor how it worked after searching and reading several texts, for example the following:

http://www.cplusplus.com/reference/functional/function/

My question is yes, it std::functionis similar to the following for example:

typedef int (*FredMemFn)(int i);
c++
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