I know that the format of uuid is XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX.
But I dont want to create a uuid, I want to create a unique identifier with a different format such as XXX-XXXX-XXX.
How do I do that using plain javascript and no libraries.
And is there any way to ensure that the identifier will be unique?
This is an example of how to create a unique fake uuid looking string. Note that this is not a real uuid.
let uuids = [];
function getRandomUuidChar(count = 1) {
// valid uuid chars: 0-9, a-f, A-F
const chars = "1234567890abcdefABCDEF".split('');
let retval = "";
for (let i = 0; i < count; i++) {
const randomIndex = Math.floor(Math.random() * chars.length);
retval += chars[randomIndex];
}
return retval;
}
function generatePseudoUuid() {
// XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
const charCounts = [8, 4, 4, 4, 12];
const uuid = charCounts
.reduce((retval, count) => {
retval.push(getRandomUuidChar(count));
return retval;
}, [])
.join("-");
if (!uuids.includes(uuid)) {
uuids.push(uuid);
return uuid;
}
generateUuid();
}
for(let i=0; i<10; i++){
console.log("uuid", generateUuid());
}
console.log(uuids);
output:
uuid 05D9F4C4-ddd8-9ff4-B5F3-c834E5da6F64
uuid 10dc0BCb-1DfD-8efB-EA7c-3f056930315C
uuid 8e5a21C0-EDD9-f3bc-bEBb-bbADe542342E
uuid b484Ca84-Ce89-eb91-94F4-8216b86A7245
uuid De70ABB8-D4E9-DBba-7783-b8109E1b5E27
uuid F1BF66b8-5458-B8d1-DA0c-6BceBea2ccc0
uuid aEffE093-faf8-FBA2-bb88-08865b446412
uuid a3AabDBC-2B4A-AcBc-8afF-8c0deCCeA92C
uuid C7b4DFaA-Da41-041a-FFfE-28064ABF5FB7
uuid E3F2F592-3AEc-aBdD-AC9c-304Dc93ceDa9
[
'05D9F4C4-ddd8-9ff4-B5F3-c834E5da6F64',
'10dc0BCb-1DfD-8efB-EA7c-3f056930315C',
'8e5a21C0-EDD9-f3bc-bEBb-bbADe542342E',
'b484Ca84-Ce89-eb91-94F4-8216b86A7245',
'De70ABB8-D4E9-DBba-7783-b8109E1b5E27',
'F1BF66b8-5458-B8d1-DA0c-6BceBea2ccc0',
'aEffE093-faf8-FBA2-bb88-08865b446412',
'a3AabDBC-2B4A-AcBc-8afF-8c0deCCeA92C',
'C7b4DFaA-Da41-041a-FFfE-28064ABF5FB7',
'E3F2F592-3AEc-aBdD-AC9c-304Dc93ceDa9'
]