JavaScript methods with the same name call each other

In JavaScript, naming between methods is very important, but sometimes we encounter methods with the same name. This situation will cause some problems in our code, and sometimes even cause confusion and errors. This article will explore the problem of calling each other with methods with the same name in JavaScript and provide some solutions.

The reason for duplicate method names

First of all, we need to understand the reason for duplicate method names. JavaScript allows multiple methods with the same name to be defined on an object. When two or more methods use the same name, the latter overrides the previously defined method. This means that only the last defined method can be called correctly.

For example, consider the following code:

var myObject = {
  saySomething: function() {
    console.log("Something");
  },
  saySomething: function() {
    console.log("Something else");
  }
};

In this code, the object myObject defines two methods with the same name. Due to the characteristics of the JavaScript language, only the last method "saySomething" can be called correctly, which outputs "Something else".

The problem of duplicate method names

When methods have duplicate names, it may cause the following problems:

1. Overwriting: Methods with the same name will overwrite each other. Only The method defined later is valid;
2. Calling error: When calling a method, the wrong method may be accidentally called;
3. Code confusion: Multiple methods with the same name may lead to code confusion and difficulty in maintenance .

How to solve the problem of duplicate method names

Now let’s take a look at how to solve the problem of duplicate method names.

1. Namespace

One way to solve the problem of duplicate names is to use "namespaces". By defining the method in a specific namespace, you can ensure the uniqueness of the method name.

For example, consider the following code:

var myNamespace = {
  saySomething: function() {
    console.log("Something");
  }
};

In this code, the method "saySomething" is defined in the "myNamespace" namespace. This means that the "saySomething" method is unique within the scope of this namespace and cannot have the same name as a method in other namespaces.

2. Alias

Using aliases is another way to solve the problem of duplicate names. By defining an alias for each method, you ensure that each alias is unique and can be called independently.

For example, consider the following code:

var myObject = {
  saySomething: function() {
    console.log("Something");
  },
  saySomeOtherThing: function() {
    this.saySomething();
  }
};

In this code, we define two different method names, "saySomething" and "saySomeOtherThing". In the "saySomeOtherThing" method, we use the "this" keyword to call the "saySomething" method. This approach ensures that the method is called correctly instead of calling an overridden method of the same name.

3. Delegation

Using method delegation is another way to solve the problem of duplicate method names. By delegating the calling relationship between methods, you can ensure that each method can be called correctly without being overwritten.

For example, consider the following code:

var myObject = {
  saySomething: function() {
    console.log("Something");
  },
  saySomeOtherThing: function() {
    this.saySomethingDelegate();
  }
};

myObject.saySomethingDelegate = myObject.saySomething.bind(myObject);

In this code, we create an alias "saySomethingDelegate" for the "saySomething" method and bind it to the object "myObject" via the "bind" method " superior. Then, in the "saySomeOtherThing" method, we call the "saySomethingDelegate" method using the "this" keyword instead of calling the overridden method of the same name.

Summary

In JavaScript, duplicate method names may cause some problems, including overwriting, calling errors, and code confusion. By using techniques such as namespaces, aliases, or delegation, you can solve the problem of method duplication and ensure that your code is correct, clear, and easy to maintain.

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