React Should I Use A Unique Key Generator

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In this example, We have shared about what is the significance of keys in ReactJS? Keys help React identify which items have changed, are added, or are removed. Keys should be given to the elements inside the array to give the elements a stable identity. It's important to note that the key code is a unique code for the key itself and doesn't change if a modifier is pressed. Has the same key code as '1'. Because different keyboards, systems, and implementations can use different values for the different keys, care should be exercised when using key codes.

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The reactKeyMap utility function hashes the first argument you pass into the callback function, usually this will be an object. It passes this hash value in as the key prop by wrapping our normal map callback function in React.cloneElement. It uses a 32 bit FNV-1 hash algorithm because FNV algorithms are simple, fast. Apr 18, 2015 Rendering List of Elements in React With JSX. Written April 18, 2015 in guide, javascript, jsx, react. Truly understanding how your JSX code will be compiled to plain old JavaScript is the key to writing predictable React everytime. Therefore, do not use this to generate unique IDs. There are much better ways to do it. However, a simple fix to get a lot less collisions would be to append the current time (new Date).getTime to the returned ID.

Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.

Symmetric Keys

The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.

React Should I Use A Unique Key Generator

To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.

The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.

When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.

Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.

When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.

Asymmetric Keys

The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.

A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:

The ToXmlString method, which returns an XML representation of the key information.
The ExportParameters method, which returns an RSAParameters structure that holds the key information.
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Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.

Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.

The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.

Installation

npm install react-keygen --save

Usage

Use reactKeyMap just like you would Array.map. However, no need to worry about finding and passing in a uniq key, reactKeyMap handles that for you!

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Each <ListItem /> component will have a uniq key created by hashing our data passed in.If you still wish to use your own keys you can still set it like you normally would, andreactKeyMap will default to the user provided key.

Behind the Curtain

The reactKeyMap utility function hashes the first argument you pass into the callback function, usually this will be an object. It passes this hash value in as the key prop by wrapping our normal map callback function in React.cloneElement.

It uses a 32 bit FNV-1 hash algorithm because FNV algorithms are simple, fast, and maintain a low collision rate. FNV hashes are also great at hashing almost identical strings, which is needed since most of the listed data in this context will be very similar.

FNV Hash Algorithm Advantages

Fast
Low collision rate
High dispersion
Simple implementation w/ little overhead

For more details see: http://www.isthe.com/chongo/tech/comp/fnv/

Tests

npm test