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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.

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.

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\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

(Lacking universally accepted terminology to talk about classes, I will makeoccasional use of Smalltalk and C++ terms. I would use Modula-3 terms, sinceits object-oriented semantics are closer to those of Python than C++, but Iexpect that few readers have heard of it.)

Derived classes may override methods of their base classes. Because methodshave no special privileges when calling other methods of the same object, amethod of a base class that calls another method defined in the same base classmay end up calling a method of a derived class that overrides it. (For C++programmers: all methods in Python are effectively virtual.)

For most purposes, in the simplest cases, you can think of the search forattributes inherited from a parent class as depth-first, left-to-right, notsearching twice in the same class where there is an overlap in the hierarchy.Thus, if an attribute is not found in DerivedClassName, it is searchedfor in Base1, then (recursively) in the base classes of Base1,and if it was not found there, it was searched for in Base2, and so on.

Dynamic ordering is necessary because all cases of multiple inheritance exhibitone or more diamond relationships (where at least one of the parent classescan be accessed through multiple paths from the bottommost class). For example,all classes inherit from object, so any case of multiple inheritanceprovides more than one path to reach object. To keep the base classesfrom being accessed more than once, the dynamic algorithm linearizes the searchorder in a way that preserves the left-to-right ordering specified in eachclass, that calls each parent only once, and that is monotonic (meaning that aclass can be subclassed without affecting the precedence order of its parents).Taken together, these properties make it possible to design reliable andextensible classes with multiple inheritance. For more detail, see

Having seen the mechanics behind the iterator protocol, it is easy to additerator behavior to your classes. Define an __iter__() method whichreturns an object with a __next__() method. If the classdefines __next__(), then __iter__() can just return self:

You can use this is Type in the return position for methods in classes and interfaces.When mixed with a type narrowing (e.g. if statements) the type of the target object would be narrowed to the specified Type.

The introduction to object-oriented concepts in the lesson titled Object-oriented Programming Concepts used a bicycle class as an example, with racing bikes, mountain bikes, and tandem bikes as subclasses. Here is sample code for a possible implementation of a Bicycle class, to give you an overview of a class declaration. Subsequent sections of this lesson will back up and explain class declarations step by step. For the moment, don't concern yourself with the details.

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.

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.

A class in C# can only directly inherit from one base class. However, because a base class may itself inherit from another class, a class might indirectly inherit multiple base classes. Furthermore, a class can directly implement one or more interfaces. For more information, see Interfaces.

A class can be declared as abstract. An abstract class contains abstract methods that have a signature definition but no implementation. Abstract classes can't be instantiated. They can only be used through derived classes that implement the abstract methods. By contrast, a sealed class doesn't allow other classes to derive from it. For more information, see Abstract and Sealed Classes and Class Members.

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Amazon S3 offers a range of storage classes that you can choose from based on the performance, data access, resiliency, and cost requirements of your workloads. S3 storage classes are purpose-built to provide the lowest cost storage for different access patterns. S3 storage classes are ideal for virtually any use case, including those with demanding performance needs, data lakes, residency requirements, unknown or changing access patterns, or archival storage.

The S3 storage classes include S3 Intelligent-Tiering for automatic cost savings for data with unknown or changing access patterns, S3 Standard for frequently accessed data, S3 Express One Zone for your most frequently accessed data, S3 Standard-Infrequent Access (S3 Standard-IA) and S3 One Zone-Infrequent Access (S3 One Zone-IA) for less frequently accessed data, S3 Glacier Instant Retrieval for archive data that needs immediate access, S3 Glacier Flexible Retrieval (formerly S3 Glacier) for rarely accessed long-term data that does not require immediate access, and Amazon S3 Glacier Deep Archive (S3 Glacier Deep Archive) for long-term archive and digital preservation with retrieval in hours at the lowest cost storage in the cloud.

You can configure S3 storage classes at the object level, and a single general purpose bucket can contain objects stored across all storage classes except S3 Express One Zone. Amazon S3 also offers capabilities to manage your data throughout its lifecycle. Once an S3 Lifecycle policy is set, your data will automatically transfer to a different storage class without any changes to your application. S3 directory buckets only allow objects stored in the S3 Express One Zone storage class, which provides faster data processing within a single Availability Zone, and do not support S3 Lifecycle policies.

S3 Standard-IA is for data that is accessed less frequently, but requires rapid access when needed. S3 Standard-IA offers the high durability, high throughput, and low latency of S3 Standard, with a low per GB storage price and per GB retrieval charge. This combination of low cost and high performance make S3 Standard-IA ideal for long-term storage, backups, and as a data store for disaster recovery files. You can configure S3 storage classes at the object level, and a single bucket can contain objects stored across S3 Standard, S3 Intelligent-Tiering, S3 Standard-IA, and S3 One Zone-IA. You can also use S3 Lifecycle policies to automatically transition objects between storage classes without any application changes.

S3 One Zone-IA offers the same high throughput, and low latency of S3 Standard, with a low per GB storage price and per GB retrieval charge. Using similar engineering designs as S3 Regional storage classes, S3 One Zone-IA also offers 11 nines of durability, but may be susceptible to data loss in the unlikely case of the loss or damage to all or part of an AWS Availability Zone. You can configure S3 storage classes at the object level, and a single bucket can contain objects stored across S3 Standard, S3 Intelligent-Tiering, S3 Standard-IA, and S3 One Zone-IA. You can also use S3 Lifecycle policies to automatically transition objects between storage classes without any application changes. 9af72c28ce