theboshy's questions

I have a question regarding this code.

 let results = [1, 2 ,3 4]
 randomArray.forEach( async (e, i) => {
        externalApi(e).subscribe(async ({data}) => {
          results.push(data);
          console.log("result", e);
        }, (error) => {
          console.log(error)
        });
    });

As you can see I am iterating over an array to get multiple results from an api and store them in results, in theory it works but because the call to the api is a promise, the results.push(data), is not going to be executed immediately, so I would expect 2 things.

1. That results had no values ​​at the end of the iteration
2. After some time results will store the values ​​obtained from the api

This in theory happens but I get these results:

// console results

$"result, 1"

$"result, 2"

$"result, 2"

$"result, 1"

$"result, 3"

$"result, 4"

This leaves me confused because, although asyncronathe job is running correctly, it seems that the iteration is sending multiple requests for each iteration or is what I understand.

That is, I would expect results after a while, but not multiple results from what I think is just one iteration.

In conclusion I would like to know:

1. Why is this happening, is there something I'm not understanding here about functions async?
2. What is the correct way to implement the promise response inside an iterator?

I have a method that receives a path to create a file in it and of course the directory I do it this way.

    public static File createTempFile(String exteString, String nombre, String path) throws IOException {
        try {
            File file = new File(path + "\\" + nombre + exteString);
//--
            Path toCreatePath = Paths.get(file.toURI());
            if (!Files.exists(toCreatePath)) {
                Files.createDirectories(toCreatePath);
            }
            return file;
        } catch (IOException e) {
            System.out.println(ReportLog.getErrorBuilder(new Object(), e));
        }
        return null;
    }

My problem is that I need to somehow hide this directory , that is, it cannot be seen by the user , since it will contain secret information.

(not explicitly confidential information only non-redundant information for the user)

I think it is possible since the class Filescontains the method isHiddenbut I still don't know how to tell the directory that it is hidden.

I am developing something in JS and I need to sort data as static variables in, I remembered a way to do this in java with the Enum , the thing I investigated is that there is no enum in js (?), so I tried to create an object

var baseValue = {
  kb = 1024.0,
  mb = 1048576,
  gb = 1099511627776
};

(it should be noted that I have not worked much on this in JS )

I try to get one of the values ​​like this

alert(baseValue.kb);

but it gives me the error Invalid shorthand property initializer

I would like to know what is the problem with handling multiple inheritance in java? that is, I was working on something when I got to the point where I needed to inherit several abstract classes with extendsin Java but I realize that it is not allowed or at least I tried something like extends CLaseA,ClaseBI have searched for a while and I have not found anything that explains why that.

so can someone help me to know why? Also, since it is not possible to do this , what other alternatives do I have?

Well my problem is that I have a <textarea>on my page and I use the attribute placeholder=to give it the user value such that: <textarea id="usuario_nick" placeholder="usuario">

The problem is that the text inside the textarea is automatically aligned to the left but I want it to be aligned towards the center of the textarea I don't mean only horizontally also vertically right in the center is it possible? Is there a way to move just the value of the placeholder in that textarea as a padding-top y right?.

I know you can take the placeholdercon ::-webkit-input-placeholderbut this takes all of them and I want it to happen only on 1 specific one.

I have a problem with the use of the '>>' character, I would like to know what function it actually fulfills, what it does, taking into account something like:

System.out.println(5>>1);the result is 2 but why? I understand that it is also called the Bits operator but it really compares the bits of these numbers and determines what?

I need if it is possible to obtain the following information from a user of my website:

1. What browser do you use?
2. What country are you applying from?
3. What language does the user handle?
4. If possible the IP address

this for the purpose of keeping a record for statistics.

Regarding the browser information, when I execute var nav = navigator.userAgent.toLowerCase().indexOf('chrome');it, it does not generate results and I have realized that the property navigatorbrings with it the information that I need, but I am not sure if I am using it correctly since using it in another way window.navigator.language;does not generate results either.

I want to know the difference between using a list with the Set<> interface and the Map<> interface, which one is better for me to access the data more easily?