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19 lines
635 B
Markdown
19 lines
635 B
Markdown
---
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title: Uncategorised
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created: 2018-06-12
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updated: 2018-06-12
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type: summary
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tags: [tech, reference]
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external: https://github.com/wahyd4/knowledge/blob/master/categories/uncategorised.md
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---
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# Uncategorised
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## Some interesting questions
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### UUID or UUID4
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* `UUID` use current time and your computer MAC address to generate the id
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* `UUID4` which is much simpler. Each and every bit of a UUID v4 is generated randomly and with no inherent logic. With the sheer number of possible combinations (2^128), it would be almost impossible to generate a duplicate unless you are generating trillions of IDs every second, for many years.
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