uuid – IT Nursery

Efficient method to generate UUID String in Java (UUID.randomUUID().toString() without the dashes)

June 1, 2022 by IT Nursery

I would like an efficient utility to generate unique sequences of bytes. UUID is a good candidate but UUID.randomUUID().toString() generates stuff like 44e128a5-ac7a-4c9a-be4c-224b6bf81b20 which is good, but I would prefer dash-less string. I’m looking for an efficient way to generate a random strings, only from alphanumeric characters (no dashes or any other special symbols). 10 … Read more

How to get a unique device ID in Swift?

May 31, 2022 by IT Nursery

How can I get a device’s unique ID in Swift? I need an ID to use in the database and as the API-key for my web service in my social app. Something to keep track of this devices daily use and limit its queries to the database. 8 Answers 8

How to create a GUID/UUID using iOS

May 29, 2022 by IT Nursery

I want to be able to create a GUID/UUID on the iPhone and iPad. The intention is to be able to create keys for distributed data that are all unique. Is there a way to do this with the iOS SDK? 8 Answers 8

Likelihood of collision using most significant bits of a UUID in Java

May 24, 2022 by IT Nursery

If I’m using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right? 5 Answers 5

When should I use uuid.uuid1() vs. uuid.uuid4() in python?

May 22, 2022 by IT Nursery

I understand the differences between the two from the docs. uuid1(): Generate a UUID from a host ID, sequence number, and the current time uuid4(): Generate a random UUID. So uuid1 uses machine/sequence/time info to generate a UUID. What are the pros and cons of using each? I know uuid1() can have privacy concerns, since … Read more

Advantages and disadvantages of GUID / UUID database keys

May 21, 2022 by IT Nursery

I’ve worked on a number of database systems in the past where moving entries between databases would have been made a lot easier if all the database keys had been GUID / UUID values. I’ve considered going down this path a few times, but there’s always a bit of uncertainty, especially around performance and un-read-out-over-the-phone-able … Read more

PHP function to generate v4 UUID

May 18, 2022 by IT Nursery

So I’ve been doing some digging around and I’ve been trying to piece together a function that generates a valid v4 UUID in PHP. This is the closest I’ve been able to come. My knowledge in hex, decimal, binary, PHP’s bitwise operators and the like is nearly nonexistent. This function generates a valid v4 UUID … Read more