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How To Do Var Self This Inside Es6 Class

ES6, also known as ECMAScript 2015, brought a lot of exciting features to JavaScript, making it more powerful and flexible for software developers. One of the handy features introduced in ES6 is the 'var self = this' construct inside a class, which can be useful for working with functions and maintaining the correct context of 'this'. In this article, we will explore how you can effectively use 'var self = this' inside an ES6 class.

When working with ES6 classes in JavaScript, you may encounter situations where you need to preserve the context of 'this' inside a function or method. This is where the 'var self = this' technique comes in handy. By assigning 'this' to another variable like 'self', you can ensure that the reference to 'this' remains consistent within the function's scope.

To use 'var self = this' inside an ES6 class, you can follow these simple steps:

1. Declare a variable inside the class constructor:

Plaintext

class MyClass {
     constructor() {
       var self = this;
     }

     myMethod() {
       // Access 'this' using 'self'
       console.log(self);
     }
   }

2. Assign 'this' to the variable 'self' in the constructor:

Plaintext

class MyClass {
     constructor() {
       var self = this;
     }
   }

3. Use 'self' instead of 'this' inside the class methods:

Plaintext

class MyClass {
     myMethod() {
       console.log(self);
     }
   }

By employing this pattern, you can avoid unexpected behavior caused by the dynamic nature of 'this' in JavaScript. This technique ensures that you have a consistent reference to the class instance throughout your code, making it easier to work with and understand.

It is important to note that the 'var self = this' approach is just one way to maintain the context of 'this' in JavaScript. Alternatively, you can use arrow functions introduced in ES6, which automatically capture the lexical scope of 'this'. However, the 'var self = this' method remains a reliable and commonly used technique, especially in situations where arrow functions are not applicable.

In conclusion, mastering the 'var self = this' technique inside an ES6 class can help you write more robust and maintainable JavaScript code. By understanding how to preserve the context of 'this' effectively, you can avoid potential pitfalls and streamline your development process. So, the next time you find yourself needing to maintain the correct context of 'this' inside a class, remember to use 'var self = this' as a valuable tool in your coding arsenal. Happy coding!

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