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UUID

A 128-bit id that needs no coordination; the common version 4 is random. 36 characters in its usual form, 22 in base62.

Taught in Chapter 26: Unique IDs.

More from the same chapter

• Base62: Writing numbers with digits and both cases of letters, 62 symbols, so codes stay short.
• Snowflake ID: A 64-bit id made of time, machine number and sequence, roughly in time order.