Ruslan López's questions

I was recently trying to encode and decode and came across some code on stackoverflow gringo and was very surprised to try it out.

$("<textarea/>").html('&lt;a&gt').val() // return '<a>'

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea/>

I expected something like no element would be added to it and it would be just as empty, but it turns out that it adds the value of the script (and I don't know if it only happens in my firefox browser, but I don't think so).

I attached a screenshot in case it doesn't look the same:

I was trying to clone my open source project on Windows 10, but got the following error:

fatal: cannot create directory at 'node_modules/bower/node_modules/update-notifier/node_modules/latest-version/node_modules/package-json/node_modules/got/node_modules/duplexify/node_modules/end-of-stream/node_modules/once/node_modules /wrappy': Filename too long

warning: Clone succeeded, but checkout failed.

You can inspect what was checked out with 'git status'

and retry with 'git restore --source=HEAD :/'

The folder where I am trying to clone is:

C:\Users\MiNombreDeUsuarioQueNoTieneEspacios\IdeaProjects

Is there a way to enable long paths?

I have the following service:

package inventarios.service;

import inventarios.repository.LoginUsersRepository;
import inventarios.to.LoginUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class LoginUsersService {
    @Autowired
    LoginUsersRepository usersRepository;

    public List<LoginUser> findAll(){
        return usersRepository.findAll();
    }
}

And the following unit test:

import inventarios.service.LoginUsersService;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.platform.runner.JUnitPlatform;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
@RunWith(JUnitPlatform.class)
class GUITest {

    @Mock
    private LoginUsersService usersService;

    @InjectMocks
    private LoginWindow loginWindow = new LoginWindow();

    @Test
    void main() {
        Mockito.when(usersService.findAll()).thenReturn(Collections.emptyList());
 }
}

However when I run it I get:

org.mockito.exceptions.base.MockitoException:

Mockito cannot mock this class: class inventarios.service.LoginUsersService.

Mockito can only mock non-private & non-final classes. If you're not sure why you're getting this error, please report to the mailing list.

My class is public and it is not final. What could be wrong?

Going through some code on github I found the following unit test:

 it('should update links when link href update', async () => {
    let anchorInstance = null;
    function AnchorUpdate({ href }) {
      return (
        <Anchor
          ref={c => {
            anchorInstance = c;
          }}
        >
          <Link href={href} title="API" />
        </Anchor>
      );
    }
    const wrapper = mount(<AnchorUpdate href="#API" />);

I don't understand what the braces are for, are they converting the parameter to an object?

Hi I have a class with a mega huge constant string

public class CharsetXYZ extends Charset {
    private static class Decoder extends XYZDecoder {
        private static final String INDEX= "HUGE STRING CONSTANT 1234567890abcchdefghijklllmnñopqrstuvwxyz...";
        ...
    }
}

and findbugs reports me the error:

INDEX is initialized to a string constant 7213 characters long that is duplicated in 6 other class files

HSC_HUGE_SHARED_STRING_CONSTANT: Huge string constants is duplicated across multiple class files

The two Oracle shortcuts do not seem ideal to me:

finalremove the keyword

public class CharsetXYZ extends Charset {
    private static class Decoder extends XYZDecoder {
        private static String INDEX= "HUGE STRING CONSTANT 1234567890abcchdefghijklllmnñopqrstuvwxyz...";
        ...
    }
}

wrap the constant in a static initialization block.

public class CharsetXYZ extends Charset {
 private final static String INDEX;
 static {
    INDEX = "HUGE STRING CONSTNT2"
 }
}

Any other way to fix it?

I am trying to calculate the area of ​​a triangle positioned on cartesian coordinates.

The triangle is formed from three points:

• a
• b
• c

Each point has two coordinates:

• x
• Y

My logic is the following:

1. calculate the distance between point a and point b call it base
2. calculate a point exactly in the middle of a and b (bisector I think it is called)
3. get the distance between midpoint of a and b and point c and call it height
4. Calculate the area with the formula base times height over two

The logic seems appropriate to me, but I'm not passing the unit tests in the exercise.

This is my code:

function distance(x1,x2,y1,y2){
  return Math.sqrt(Math.pow((x2-x1),2) + Math.pow((y2-y1),2));
}

function area(b,h){
  return (b*h)/2;
}

function midlePoint(x1,x2,y1,y2){
  return new Point((x1+x2)/2,(y1+y2)/2);
}

function triangleArea(triangle){
  var {a,b,c} = triangle;
  var {x:x1,y:y1} = a;
  var {x:x2,y:y2} = b;
  var base = distance(x1,x2,y1,y2);
  console.log(base);
  var {x:midlex,y:midley} = midlePoint(x1,x2,y1,y2);
  var {x:x3,y:y3} = c;
  var height = distance( midlex,x3,midley,y3);
  console.log(height);
  return area(base,height);
}

These are the unit tests:

Test.assertEquals(+triangleArea(new Triangle(new Point(10, 10), new Point(40, 10), new Point(10, 50))).toFixed(6), 600)
Test.assertEquals(+triangleArea(new Triangle(new Point(15, -10), new Point(40, 20), new Point(20, 50))).toFixed(6), 675)

What will be the problem?

What is this?

It is a collection of questions and answers. It's also a community wiki so everyone is welcome to contribute, usually less reputation is required than for a lot of the stuff on the site.

What for?

It is a tag that suffers from questions of the type "tell me what my regular expression means".

What is the scope?

Essentially these languages:

• php
• Java
• javascript
• python
• Ruby
• .net
• pearl
• r

It might seem very extensive, but these languages ​​share common features.

I have a program that is giving me undefinedbecause I misdefined my multidimensional array.

In Java I would do it like this:

int[][] array=new int[][] {{1, 2}, {3, 4}};
final int filas = array.length;
final int columnas = array[0].length;
int[][] returnedArray = new int[columnas][filas];

but in javascript I don't know how to do it.

This is what I have tried:

var array=[[1, 2], [3, 4]];
var returnedArray = [[columnas],[filas]];
var returnedArray = [[columnas,filas]];
var returnedArray = [];

but any attempt to fill the indexes of the returnedArrayis failing me.

Thanks in advance.

Today answering a question on this site I found a very interesting possible solution, because I accidentally deleted a part of the solution and that solution worked even though it didn't make sense to me.

Without any more preambles:

const regex = /([a-zA-Z]+)_([a-zA-Z]+_?[a-zA-Z]+?)((?:_\d+)+)/

const strings = [
        'AAAA_BBBB_CCCC_1_15_17'
        ,'AAAA_BBBB_1'
        ,'AAAA_BBBB_15_17'
        ,'AAAA_BBBB_CCCC_1_2'
    ]

strings.forEach(string => {
  const [fullMatch, ...groups] = string.match(regex)
  console.log(groups)
})

As you can see, I captured a group without capture using ((?:_\d+)+), and on the regex101 site it works for all languages, which up to now are:

• pcre (php)
• javascript
• python
• golang

Note: seeing that not everyone reads all the available information, the important thing is that I am obtaining the behavior of

/([a-zA-Z]+)_([a-zA-Z]+_?[a-zA-Z]+?)((?:_\d+)+(?:_\d+)*)/

wearing

/([a-zA-Z]+)_([a-zA-Z]+_?[a-zA-Z]+?)((?:_\d+)+)/

which is strange, because if I don't catch, the caught group is just the last part that matches:

const regex = /(_\d+)+/g;
const str = `_1_2_3_4_5_6_7`;
let m;

while ((m = regex.exec(str)) !== null) {
  // This is necessary to avoid infinite loops with zero-width matches
  if (m.index === regex.lastIndex) {
    regex.lastIndex++;
  }

  // The result can be accessed through the `m`-variable.
  m.forEach((match, groupIndex) => {
    console.log(`Found match, group ${groupIndex}: ${match}`);
  });
}

I wish someone would explain to me why using a double capture worked and what the implications (positive or negative) are of trapping a group without capturing the way I did.

I'd like to trace the execution of regular expressions to see what it does at each step so I can compare how well or how poorly various regular expressions perform using java .

How can I achieve this?

For me it would be great to know how many steps the Java engine takes, so continuing to use other engines is sub-optimal from my point of view,

If you need an example of what I am talking about, I am referring to the debug functionality of the regex101.com page.

I have the following junit unit test and discovered something very interesting

public class MyTest {
    @Test
    public void BasicTest() {
     assertEquals("0.0!=-0.0",new Double(0.0D),new Double(-3.0D*0.0D));
    }
}

It gives me the error message:

0.0!=0.0 expected:<0.0> but was:<-0.0>

Why is 0.0 not equal to -0.0 in Java? What ways are there to get around this error?

Having the following example to add a file AudioTest_(1).mp3to an html5 audio element , I want to additionally add the file in case there is no codec to play the first one.AudioTest_(1).ogg

var audioel = document.getElementById('audioElem');
if (audioel !== null) {
  audioel.setAttribute('src', 'http://developer.mozilla.org/@api/deki/files/2926/=AudioTest_(1).mp3');
}

<audio id="audioElem" autoplay>
  Your browser does not support the <code>audio</code> element.
</audio>

Normally you would have multiple items sourceand the browser would automatically pick the first one that has the codecs to play it for, but I don't know if it's possible to do this using Javascript Only or if there is some other way to load the file than if it can be played from a list provided in execution time.

PS: Preferably not to use jQuery.

Thanks in advance.

I have tried to configure the export of a simple project to webgl in unity3d but I am not sure how much memory I should allocate in the PlayerSettings.

If I put 16 I get

If I put 60 I get

Experimentally I found that on localhost it works perfectly with 40

But I understand that it depends largely on the equipment that runs it (Mine has 16 gigs of RAM and a 1 Giga nVidia graphics processor )

Is there a way or formula to calculate the appropriate amount to work on the most computers? Do I need to change my settings when exporting to a hosting server ? Is there a way to dynamically allocate that memory and work on all computers?

I've been working on a fork of a project GitHuband I'm many commits ahead of the original repository.

I wanted to integrate it but they asked me to send it in several pull requests instead of all the commits in one (because there were more than 20). Is there a way to make a commit pull request that doesn't contain the latest commits I've made to my repository?

PS: Sorry for the Spanglish, but I really don't know how those terms are translated into Spanish.

I am contributing a NetBeans module that I found on GitHub, I updated the changes and when trying to run I get the following message:

Scanning for modules in C:\Program Files\NetBeans 8.0.2\nb
Scanning for modules in C:\Program Files\NetBeans 8.0.2\platform
Scanning for modules in C:\Program Files\NetBeans 8.0.2\apisupport
Scanning for modules in C:\Program Files\NetBeans 8.0.2\ide
Scanning for modules in C:\Program Files\NetBeans 8.0.2\java
Scanning for modules in C:\Program Files\NetBeans 8.0.2\profiler
Scanning for modules in C:\Program Files\NetBeans 8.0.2\harness
C:\Program Files\NetBeans 8.0.2\harness\build.xml:174: No dependent module org.netbeans.api.templates
BUILD FAILED (total time: 0 seconds)

The most curious thing is that when looking in the dependencies if it comes out

I would appreciate if someone knows how to fix it.

I have been working with maven in netbeans and I would like to use the maven that it already comes with but now from the console and not download it again.

When I open the configuration instead of the path it tells me embedded maven.

Does anyone know where I can find it if I have Netbeans 8.0.2?

My operating system is Windows.

Seeing css in 3D on http://tridiv.com/ I wondered if it is possible to import models already made in a 3D editor like Blender or Maya to use them in a page made with css3 and HTML5. Google searches give me too many irrelevant results.

Does anyone know how to achieve it?

I've heard that Java classes have something called a magic number in their headers that identifies them, and it says something like 0xCAFEBABE.

Could someone explain to me how I can check such information?

There are examples of very complicated images made exclusively with css on the web, such as the Mona Lisa in CSS .

Obviously, they must have used some algorithm to generate them.

I would like to know how they achieve it and if it is possible that the generated css is totally portable between the most common browsers.

Running a page and setting the background color value to an arbitrary string such as "chucknorris"the background turns red. Why does this happen?

<body bgcolor="chucknorris">test</body>

Original question: Why does HTML think “chucknorris” is a color?