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PHP : Difference b/w new self and new object()


PHP : Difference b/w new self and new object()

By : user2957029
Date : November 22 2020, 03:03 PM
With these it helps "self" is a keyword that references the current class. It is only available inside the class' code.
You can use it to call methods on your own class, but due to binding you can also use it to call methods on a superclass.
code :
class TestA {
  public static function makeNewInstance() {
    return new TestA();
  }
}

class TestB extends TestA {
}
class TestA {
  public static function makeNewInstance() {
    return new self();
  }
}

class TestB extends TestA {
}


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What's the difference between a jQuery object and a DOM element? Difference between .get() and .index()?

What's the difference between a jQuery object and a DOM element? Difference between .get() and .index()?


By : Rishi Patel
Date : March 29 2020, 07:55 AM
This might help you The get method is used to access the DOM elements within a jQuery object:
code :
var allDivs = $("div").get();
<ul>
    <li>1</li>
    <li id="second">2</li>
    <li>3</li>
</ul>
console.log($("#second").index()) //Prints "1"
<div id="example">
    Some text
    <div>Another div</div>
    <!--A comment-->
</div>
var div = $("#example").get(0);
for(var i = 0; i < div.childNodes.length; i++) {
   console.log(div.childNodes[i].nodeType);   
}
3 - Text node ("Some text")
1 - Element node (div)
3 - Text node ("Another div")
8 - Comment node (<!-- -->)
3 - Text node ("A comment")
Is there anyway to order static object initialization of difference class (difference file)

Is there anyway to order static object initialization of difference class (difference file)


By : chase he
Date : March 29 2020, 07:55 AM
may help you . This is called the "static initialization order fiasco"
A common approach is to use initialize-on-first-use within an "accessor function"
code :
class WORKSPACE_A {

   AAA& getA()
   {
     static AAA a;
     return a;
   }
}
difference between Object.Equals(object,object) and Object.ReferenceEquals(object,object) in c#

difference between Object.Equals(object,object) and Object.ReferenceEquals(object,object) in c#


By : Karen Andersen
Date : March 29 2020, 07:55 AM
around this issue As others have noted, differences only occur if the Equals method is overridden, because the base implementation in object relies on ReferenceEquals.
Consider the following example:
code :
public class Person {
    public string Firstname { get; set; }
    public string Lastname { get; set; }
    public DateTime Birthdate { get; set; }

    public override bool Equals(object other) {
        var otherPerson = other as Person;
        if (otherPerson == null) {
            return false;
        }
        return Firstname == otherPerson.Firstname
            && Lastname == otherPerson.Lastname
            && Birthdate == otherPerson.Birthdate;
    }
}
var person1 = new Person(Firstname = "John", Lastname = "Doe", Birthdate = new DateTime(1973, 01, 04));

var person2 = new Person(Firstname = "John", Lastname = "Doe", Birthdate = new DateTime(1973, 01, 04));

bool isSameContent = person1.Equals(person2);         // true
bool isSameObject = person1.ReferenceEquals(person2); // false

var person3 = person1;
bool isSameObject2 = person1.ReferenceEquals(person3); // true
javascript difference between function constructor object and an object inside object

javascript difference between function constructor object and an object inside object


By : user1932303
Date : March 29 2020, 07:55 AM
Hope that helps This is probably because inside your RootQueryType, the field book does not contain any reference of any of your custom declared types let's say AuthorType. Your field book is therefore, only dependant on either BookType or any of the other GraphQLObjects that you may have imported at the top. Same goes for the field author. There should not be any reference of BookType inside it.
However, in the case of your custom Types( BookType or AuthorType), they might contain references of each other and hence they are dependant on each other.
C++ method in thread. Difference between passing: object, object's address, std::ref of object

C++ method in thread. Difference between passing: object, object's address, std::ref of object


By : Diego Dgm
Date : March 29 2020, 07:55 AM
Hope that helps I am trying to execute an object's method in a C++ thread. ,
Why is that I have 2 copies of the object instead of 1?
code :
std::invoke(decay_copy(std::forward<Function>(f)), 
            decay_copy(std::forward<Args>(args))...);
thread t(&Warrior::attack, conan, 5);
thread t([&](){ return conan.attack(5); });
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