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UUID (Universally Unique Identifier) is a unique identifier that is used to identify information in computer systems. In Ruby, there are several different ways to generate a UUID. In this tutorial, we will explore four different methods for generating UUID in Ruby and provide examples for each method.
The SecureRandom library in Ruby provides a secure way to generate random numbers and strings. To generate a UUID using the SecureRandom library, you can use the following code:
require 'securerandom' uuid = SecureRandom.uuid puts uuid
This code imports the SecureRandom library and calls the uuid
method to generate a random UUID. The generated UUID is then printed to the console.
The UUIDTools gem is a library that provides utilities for generating and manipulating UUIDs. To generate a UUID using the UUIDTools gem, you can use the following code:
require 'uuidtools' uuid = UUIDTools::UUID.random_create puts uuid
This code imports the UUIDTools library and calls the random_create
method to generate a random UUID. The generated UUID is then printed to the console.
You can also generate a UUID from a string using the Digest library in Ruby. To generate a UUID from a string, you can use the following code:
require 'digest' uuid = Digest::UUID.uuid_v5(Digest::UUID::DNS_NAMESPACE, 'example.com') puts uuid
This code imports the Digest library and uses the uuid_v5
method to generate a UUID from the given string and a namespace. In this example, we use the DNS namespace and the string 'example.com'. The generated UUID is then printed to the console.
If you need to generate a formatted UUID with hyphens, you can use the SecureRandom library in combination with the insert
method. Here is an example:
require 'securerandom' uuid = SecureRandom.uuid.insert(8, '-').insert(13, '-') puts uuid
This code generates a UUID using the SecureRandom library and then inserts hyphens at the 8th and 13th positions to format the UUID. The resulting formatted UUID is then printed to the console.
In this tutorial, we explored four different methods for generating UUID in Ruby. We covered using the SecureRandom library, the UUIDTools gem, generating UUID from a string, and generating formatted UUID with the SecureRandom library. You can choose the method that best fits your needs based on your requirements.
1. SecureRandom Library - https://ruby-doc.org/stdlib-2.6.3/libdoc/securerandom/rdoc/SecureRandom.html
2. UUIDTools Gem - https://rubygems.org/gems/uuidtools
3. Digest Library - https://ruby-doc.org/stdlib-2.6.3/libdoc/digest/rdoc/Digest.html
That's it! We hope this tutorial helped you understand different ways of generating UUID in Ruby. Happy coding!