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uuid-js
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A js library to generate and parse UUIDs,TimeUUIDs and generate TimeUUID based on Date for range selections
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A js library to generate and parse UUID's, TimeUUID's and generate empty TimeUUID's based on TimeStamp for range selections.
var UUID = require('uuid-js');
// Generate a V4 UUID
var uuid4 = UUID.create();
console.log(uuid4.toString());
// Prints: 896b677f-fb14-11e0-b14d-d11ca798dbac
// Generate a V1 TimeUUID
var uuid1 = UUID.create(1);
console.log(uuid1.toString());
// First and last possible v1 TimeUUID for a given timestamp:
var date = new Date().getTime();
var uuidFirst = UUID.fromTime(date, false);
var uuidLast = UUID.fromTime(date, true);
console.log(uuidFirst.toString(), uuidLast.toString());
// Prints: aa0f9af0-0e1f-11e1-0000-000000000000 aa0f9af0-0e1f-11e1-c0ff-ffffffffffff
// Use these TimeUUID's to perform range queries in cassandra:
var today = new Date().getTime();
var last30days = (new Date().setDate( today.getDate() - 30 )).getTime();
var rangeStart = UUID.firstFromTime(last30days);
var rangeEnd = UUID.lastFromTime(today);
var query = ...("select first 50 reversed ?..? from user_twits where key=?", [ rangeStart, rangeEnd, "patricknegri" ]);
$ npm install uuid-js
These are available just with require and return an instance of the UUID object:
UUID.create(4); // Generate V4 UUID
UUID.create(1); // Generate V1 TimeUUID
UUID.fromTime(time, last); // Generate a V1 empty TimeUUID from a Date object (Ex: new Date().getTime() )
UUID.firstFromTime(time); // Same as fromTime but first sequence
UUID.lastFromTime(time); // Same as fromTime but last sequence
UUID.fromURN(strId); // Generate a UUID object from string
UUID.fromBytes(ints); // Generate a UUID object from bytes
UUID.fromBinary(binary); // Generate a UUID object from binary
These must be called on an instance of the UUID object:
uuid.fromParts(timeLow, timeMid, timeHiAndVersion, clockSeqHiAndReserved, clockSeqLow, node);
uuid.toString(); // hex string version of UUID
uuid.toURN(); // same as hex, but with urn:uuid prefix
uuid.toBytes(); // converted to an array of bytes
make test
This work was based RFC and by the work of these people.
FAQs
A js library to generate and parse UUIDs,TimeUUIDs and generate TimeUUID based on Date for range selections
The npm package uuid-js receives a total of 43,969 weekly downloads. As such, uuid-js popularity was classified as popular.
We found that uuid-js demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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