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18 lines
708 B
JavaScript
18 lines
708 B
JavaScript
/*
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Generates a UUID/GUID in Node.Js.
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The script uses `Math.random` in combination with the timestamp for better randomness.
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The function generate an RFC4122 (https://www.ietf.org/rfc/rfc4122.txt) version 4 UUID/GUID
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*/
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const Guid = () => {
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const pattern = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
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let currentDateMilliseconds = new Date().getTime()
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return pattern.replace(/[xy]/g, currentChar => {
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const randomChar = (currentDateMilliseconds + Math.random() * 16) % 16 | 0
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currentDateMilliseconds = Math.floor(currentDateMilliseconds / 16)
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return (currentChar === 'x' ? randomChar : (randomChar & 0x7 | 0x8)).toString(16)
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})
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}
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console.log(Guid()) // 'edc848db-3478-1760-8b55-7986003d895f'
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