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emilbayes/sequential-time-ids.js

Created July 30, 2019 11:47
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sequential-time-ids.js
function generator () {
var lastTime = Date.now()
var cnt = 0
return function () {
var currentTime = Date.now()
if (currentTime !== lastTime) {
lastTime = currentTime
cnt = 0
}
// move lastTime up 10 bits, meaning there can be 2^11 - 1
// ids in the same milli second. Note that multiplied time
// must be a Number.isSafeInteger to not loose precision
return (lastTime * 2048) + cnt++
}
}
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