deluf's questions

I have 2 variables that manipulate the same image

In the html:

    <i class="fa fa-trash-o" aria-hidden="true" ng-click="vm.deleteMessage()" ng-show="!vm.instance.deleted" ng-show="!vm.flagDelete"></i>

but it never changes, what is my mistake?

I have the following code

(function () {
    'use strict';

    angular
        .module('socialChat')
        .component('messageItem', {
            controller: 'MessageItemController',
            bindings: {
                chatUser: '<',
                instance: '<'
            },
            templateUrl: '/js/social-chat/components/message-item/message-item.html'
        });
})();

I do not understand this part

bindings: {
                    chatUser: '<',
                    instance: '<'
                },

what do those < operators mean, and I think there are =,&

I made the following code:

import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
import java.lang.Math; // headers MUST be above the first class 

// one class needs to have a main() method 
public class HelloWorld 
{ 
    // arguments are passed using the text field below this editor 
    public static void main(String[] args) 
    { 

          String ori = "kdya"; 
          String pa = "[kd]"; 
          Pattern pat = Pattern.compile(pa); 
          Matcher mat = pat.matcher(ori); 
          System.out.println(mat.matches()); 

    } 
}

I want to match the start of the original String (the first character) with any character in the pattern list.

It doesn't match, but it does exist. It's wrong?

I have to validate a word that can start with y, gor h.

For example, it can be yugo..., hugo...or gugo....

var original = "gugoss",
    regex    = /[ygh]/,                      
    coincid  = original.match(regex);  
console.log(coincid);

How can I make it match 1 of those letters at the start of the String, regardless of the rest of the characters it contains?

The event:

@Autowired
private ApplicationEventPublisher publisher;

send:

eventPublisher.publish(new CreateParticipantEvent(conversation, participant));

Do you send notifications to everyone? How does it work?

I was reviewing code, and I see everywhere the LOG class

is it to log in?

 @Component
class ApplicationEventListener {

    @SuppressWarnings("unused")
    private static Logger LOG = LoggerFactory.getLogger(ApplicationEventListener.class);

and calls the same class.

i am using spring

How do I download(clone) and push changes to a branch in git?

I have been using git for a long time, to download the latest version I used

git -pull

and to upload my changes I did it with

git push 

but it overwrites the changes that my friend made, so how do I make it work in sync?

for example reviewing this code

@Aspect
class CommandExecuteInterceptor implements ApplicationContextAware {

    private ApplicationContext context;

what does @aspect mean, why use it, when to use it?

According to law, each method has its objective:

post to insert records,

get to get/display records,

put to modify records,

delete to remove records

I made the following code, which adds a new book to the database, so I should use the post method, but I did it with the get method, I want to convert it to a post method, how to do it?

@RequestMapping(value = "/add/{id}/{name}/{author}/{price}")
    public Book addBook(@PathVariable int id, @PathVariable String name, @PathVariable String author,
            @PathVariable long price) {
        Book book = new Book();
        book.setId(id);
        book.setName(name);
        book.setAuthor(author);
        book.setPrice(price);
        bookService.saveBook(book);
        return book;
    }

I'm doing some crud tests with spring-boot, but in the dependency of

ojdbc stays in red, I think it is not being imported.

I don't know how to create a new project with spring initializr that contains @repository, @service, and @controller, for the controller dependency to exist it is necessary to check the following box, here is a screenshot:

but for the others, what should be marked?, or how do I add them manually

According to @luiggiMendoza's comment, the other 2 are from the core, but which framework?

what is the @services dependency

what is the dependency of @repositories

what is the @controllers dependency

i mean dependencies in pom.xml file

If I'm not mistaken @controllers has the dependency

starter.web

and what are the dependencies for repositories and services?