Summary  
Illustrates how the `this` keyword in object methods is dynamically bound based on the call site, allowing methods to access their owning object’s properties and change context when reassigned.

General domain of usage  
Client-side web development

Understanding how the `this` keyword works in JavaScript is crucial for working with object methods. The value of `this` is not fixed. It is dynamic and determined by how a function is called. In the context of object methods, `this` usually refers to the object that owns the method. This dynamic nature allows methods to access and manipulate the data stored within their own object.

const car = {
  brand: "Toyota",
  getBrand: function() {
    return this.brand;
  }
};

console.log(car.getBrand()); // "Toyota"

In the example above, the `car` object has a property called `brand` and a method called `getBrand`. Inside the `getBrand` method, `this.brand` refers to the `brand` property of the `car` object. When you call `car.getBrand()`, JavaScript sets `this` to point to the `car` object, so the method returns `"Toyota"`.

However, because `this` is dynamic, its value can change depending on how the method is called. If you assign the `getBrand` method to another object, `this` will refer to the new object instead.

const car = {
  brand: "Toyota",
  getBrand: function() {
    return this.brand;
  }
};

const bike = {
  brand: "Trek"
};

bike.getBrand = car.getBrand;

console.log(bike.getBrand()); // "Trek"

What will be logged to the console when the code below is run?

Build and manipulate objects to organize data, extend functionality with prototypes, and control context using the this keyword. Apply inheritance, composition, and immutability to write flexible, maintainable code, and use modern techniques like Object.assign and the spread syntax to create clean, efficient object patterns for any project.

Explore the fundamentals of JavaScript objects, the building blocks of structured data. Learn how to define, modify, and inspect object properties, including advanced concepts like property descriptors and enumerability.

Understand how JavaScript's prototype system enables inheritance and code reuse. Dive into the behavior of the "this" keyword in different contexts, from regular methods to constructor and prototype functions.

Apply modern patterns for copying, extending, and composing objects. Learn how to create cleaner, more maintainable code using techniques like immutability, Object.assign, and the spread syntax.

Understanding this in Methods

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Understanding this in Methods