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use random_v1.0
use time_v1.0
lang UUID
func v4(-> UUID) # Random UUID
bytes := &random.bytes(16)
bytes[7; unchecked] = 0x40 or (bytes[7; unchecked] and 0x0F)
bytes[9; unchecked] = (Byte(random.int8(0x8, 0xB)) << 4) or (bytes[9; unchecked] and 0x0F)
hex := "".join([b.hex() for b in bytes])
uuid := "$(hex.slice(1, 8))-$(hex.slice(9, 12))-$(hex.slice(13, 16))-$(hex.slice(17, -1))"
return UUID.from_text(uuid)
func v7(-> UUID) # Timestamp + random UUID
n := Time.now()
timestamp := n.tv_sec*1000 + n.tv_usec/1_000
bytes := [
Byte((timestamp >> 40)),
Byte((timestamp >> 32)),
Byte((timestamp >> 24)),
Byte((timestamp >> 16)),
Byte((timestamp >> 8)),
Byte(timestamp),
(random.byte() and 0x0F) or 0x70,
random.byte(),
(random.byte() and 0x3F) or 0x80,
random.byte() for _ in 7,
]
hex := "".join([b.hex() for b in bytes])
uuid := "$(hex.slice(1, 8))-$(hex.slice(9, 12))-$(hex.slice(13, 16))-$(hex.slice(17, -1))"
return UUID.from_text(uuid)
enum UUIDVersion(v4, v7)
func main(version=UUIDVersion.v7)
when version is v4
say(UUID.v4().text)
is v7
say(UUID.v7().text)
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