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Classes are a template for creating objects. They encapsulate data with code to work on that data. Classes in JS are built on prototypes but also have some syntax and semantics that are unique to classes.

Like function expressions, class expressions may be anonymous, or have a name that's different from the variable that it's assigned to. However, unlike function declarations, class declarations have the same temporal dead zone restrictions as let or const and behave as if they are not hoisted.

Methods are defined on the prototype of each class instance and are shared by all instances. Methods can be plain functions, async functions, generator functions, or async generator functions. For more information, see method definitions.

The static keyword defines a static method or field for a class. Static properties (fields and methods) are defined on the class itself instead of each instance. Static methods are often used to create utility functions for an application, whereas static fields are useful for caches, fixed-configuration, or any other data that doesn't need to be replicated across instances.

As seen above, the fields can be declared with or without a default value. Fields without default values default to undefined. By declaring fields up-front, class definitions become more self-documenting, and the fields are always present, which help with optimizations.

It's an error to reference private fields from outside of the class; they can only be read or written within the class body. By defining things that are not visible outside of the class, you ensure that your classes' users can't depend on internals, which may change from version to version.

When a static or instance method is called without a value for this, such as by assigning the method to a variable and then calling it, the this value will be undefined inside the method. This behavior is the same even if the "use strict" directive isn't present, because code within the class body is always executed in strict mode.

\n It's an error to reference private fields from outside of the class; they can only be read or written within the class body.\n By defining things that are not visible outside of the class, you ensure that your classes' users can't depend on internals, which may change from version to version.\n

When a static or instance method is called without a value for this, such as by assigning the method to a variable and then calling it, the this value will be undefined inside the method. This behavior is the same even if the \"use strict\" directive isn't present, because code within the class body is always executed in strict mode.

In the given example we show multiple examples of valid arbitrary expressions that produce a class name. This shows a call to a function, string concatenation, and the ::class constant.

Note: The class name resolution using ::class is a compile time transformation. That means at the time the class name string is created no autoloading has happened yet. As a consequence, class names are expanded even if the class does not exist. No error is issued in that case.

A common need for data binding is manipulating an element's class list and inline styles. Since class and style are both attributes, we can use v-bind to assign them a string value dynamically, much like with other attributes. However, trying to generate those values using string concatenation can be annoying and error-prone. For this reason, Vue provides special enhancements when v-bind is used with class and style. In addition to strings, the expressions can also evaluate to objects or arrays.

Welcome to Google's Python Class -- this is a free class for people with a little bit of programming experience who want to learn Python. The class includes written materials, lecture videos, and lots of code exercises to practice Python coding. These materials are used within Google to introduce Python to people who have just a little programming experience. The first exercises work on basic Python concepts like strings and lists, building up to the later exercises which are full programs dealing with text files, processes, and http connections. The class is geared for people who have a little bit of programming experience in some language, enough to know what a "variable" or "if statement" is. Beyond that, you do not need to be an expert programmer to use this material.

To get started, the Python sections are linked at the left -- Python Set Up to get Python installed on your machine, Python Introduction for an introduction to the language, and then Python Strings starts the coding material, leading to the first exercise. The end of each written section includes a link to the code exercise for that section's material. The lecture videos parallel the written materials, introducing Python, then strings, then first exercises, and so on. At Google, all this material makes up an intensive 2-day class, so the videos are organized as the day-1 and day-2 sections.This material was created by Nick Parlante working in the engEDU group at Google. Special thanks for the help from my Google colleagues John Cox, Steve Glassman, Piotr Kaminski, and Antoine Picard. And finally thanks to Google and my director Maggie Johnson for the enlightened generosity to put these materials out on the internet for free under the Creative Commons Attribution 2.5 license -- share and enjoy!

A type that is defined as a class is a reference type. At run time, when you declare a variable of a reference type, the variable contains the value null until you explicitly create an instance of the class by using the new operator, or assign it an object of a compatible type that may have been created elsewhere, as shown in the following example:

An optional access modifier precedes the class keyword. Because public is used in this case, anyone can create instances of this class. The name of the class follows the class keyword. The name of the class must be a valid C# identifier name. The remainder of the definition is the class body, where the behavior and data are defined. Fields, properties, methods, and events on a class are collectively referred to as class members.

Although they're sometimes used interchangeably, a class and an object are different things. A class defines a type of object, but it isn't an object itself. An object is a concrete entity based on a class, and is sometimes referred to as an instance of a class.

When an instance of a class is created, a reference to the object is passed back to the programmer. In the previous example, object1 is a reference to an object that is based on Customer. This reference refers to the new object but doesn't contain the object data itself. In fact, you can create an object reference without creating an object at all:

This code creates two object references that both refer to the same object. Therefore, any changes to the object made through object3 are reflected in subsequent uses of object4. Because objects that are based on classes are referred to by reference, classes are known as reference types.

The preceding sections introduced the syntax to declare a class type and create an instance of that type. When you create an instance of a type, you want to ensure that its fields and properties are initialized to useful values. There are several ways to initialize values:

Adding parameters to the class name defines the primary constructor. Those parameters are available in the class body, which includes its members. You can use them to initialize fields or anywhere else where they're needed.

Classes fully support inheritance, a fundamental characteristic of object-oriented programming. When you create a class, you can inherit from any other class that isn't defined as sealed. Other classes can inherit from your class and override class virtual methods. Furthermore, you can implement one or more interfaces.

Inheritance is accomplished by using a derivation, which means a class is declared by using a base class from which it inherits data and behavior. A base class is specified by appending a colon and the name of the base class following the derived class name, like this: 2351a5e196