JavaScriptAlgorithms/String/GenerateGUID.js at master · light1120/JavaScriptAlgorithms · GitHub

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Generates a UUID/GUID in Node.Js.

The script uses `Math.random` in combination with the timestamp for better randomness.

The function generate an RFC4122 (https://www.ietf.org/rfc/rfc4122.txt) version 4 UUID/GUID

export const Guid = () => {

const pattern = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'

let currentDateMilliseconds = new Date().getTime()

return pattern.replace(/[xy]/g, currentChar => {

const randomChar = (currentDateMilliseconds + Math.random() * 16) % 16 | 0

currentDateMilliseconds = Math.floor(currentDateMilliseconds / 16)

return (currentChar === 'x' ? randomChar : (randomChar & 0x7 | 0x8)).toString(16)

})

}

// > Guid()

// 'edc848db-3478-1760-8b55-7986003d895f'

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