unique-var-name (beta version)

JS unique short var names generator without collisions

Features

• Shortest names.
• First symbol not digit. URL and name-friendly: No special characters.
• Not random names.
• ([a-zA-Z_][0-9a-zA-Z_]*) name format.
• Counter: "a", "b", ..., "z", "A", ..., "Z", "_", "a0", "a1", ..., "a_", "b0", ... "__", "a00", ...
• Can be used as variable names, class names, id, and other.
• Like a num.toString(radix), but radix increased from 36 to 63 and first symbol not digit.
• No dependencies. No network connection.
• Different counter for each key/prefix.
• Fast: 210-240M calls / second (Ryzen 5500U).

Examples:

Available in folder /examples/

1. Show how to generate var names

import {nextUniqueVarName} from "@telemok/unique-var-name.js"

let m = new Set();
for (let i = 0; i < 7370; i++) {
	let s = nextUniqueVarName();
	console.log(i, s);
	if (m.has(s))
		throw(new Error(s))
	m.add(s);
}
/* output:
0 a
1 b
2 c
...
49 X
50 Y
51 Z
52 _
53 a0
54 a1
55 a2
...
3388 _X
3389 _Y
3390 _Z
3391 __
3392 a00
3393 a01
3394 a02
...
7357 a_X
7358 a_Y
7359 a_Z
7360 a__
7361 b00
7362 b01
7363 b02
...
*/

2. Show how to generate strings with prefix

import {nextUniqueString} from "@telemok/unique-var-name.js"

for (let i = 0; i < 7370; i++) {
	let s = nextUniqueString("prefix_");
	let sA1 = nextUniqueString("_");
	let sA2 = nextUniqueString("_");
	console.log(i, s, sA1, sA2);
}
/* output:
0 prefix_0 _0 _1
1 prefix_1 _2 _3
2 prefix_2 _4 _5
...
29 prefix_t _W _X
30 prefix_u _Y _Z
31 prefix_v __ _10
32 prefix_w _11 _12
33 prefix_x _13 _14

//new size begin on symbol "1", skip "0"
*/

Source code:

https://npmjs.com/@telemok/unique-var-name

Installation:

1. Create your NodeJs, Browser or Webview app.
2. Run: npm import @telemok/unique-var-name
3. Code: import { nextUniqueVarName } from '@telemok/unique-var-name';
4. Code: var nextName = nextUniqueVarName();

Functions:

/* Different counter for each key.
240M calls / second (Ryzen 5500U).
return unique shortest string with first symbol not digit
*/
nextUniqueVarName(key);

/* Different counter for each prefix.
210M calls / second (Ryzen 5500U).
return prefix + unique shortest string
*/
nextUniqueString(prefix);

/*Return one random char from string*/
getRandomCharOfString(str);

Tests:

Test1.Generate 30000000 unique names

ok

Another libs another authors:

Warning, table has many mistakes!

Url | Lng | Resultlength | Collis | Can bevar name | # | Regex| Comment --- | --- | -------------- | ------ | ------------------ |---| ---- | ------ https://npmjs.com/package/@telemok/unique-var-name nextUniqueVarName (key) | JS | short | auto | yes | n | [a-zA-Z_][a-zA-Z0-9_]* | this https://npmjs.com/package/@telemok/unique-var-name nextUniqueString (prefix) | JS | short | auto | no | n | [a-zA-Z0-9_]* | this .toString(radix) | JS | short | manual | no | - | [0-9a-z]* | https://npmjs.com/package/@gorebel/css-class-generator | JS | short | manual | no | | [-a-zA-Z]+ | https://npmjs.com/package/scopeid | JS | short | auto | no | n | [0-9] | https://npmjs.com/package/element-id-generator | JS | short | auto | no | 1 | [0-9a-z] | https://npmjs.com/package/nanoid | JS | 21 | chance | no | | [A-Za-z0-9_-]{21} | fast?popular https://npmjs.com/package/identifier | JS | fix | chance | no | | [a-zA-Z0-9_]{n} | https://npmjs.com/package/node-random-name | JS | no | chance | no | | humannames | https://npmjs.com/package/unique-names-generator | JS | no | chance | no | | goodsnames | https://npmjs.com/package/project-name-generator | JS | no | chance | no | | projectnames | https://npmjs.com/package/unique-string | JS | 32 | chance | no | | [a-z0-9]{32} | 14M dl https://npmjs.com/package/@paralleldrive/cuid2 | JS | 24 | chance | no | | [a-z0-9]{24} | https://npmjs.com/package/randomstring | JS | ? | chance | ? | | [a-z0-9]+ | https://npmjs.com/package/random-ext | JS | ? | chance | ? | | [a-z0-9]+ | https://npmjs.com/package/hat | JS | 32 | chance | no | | [a-z0-9]{32} | https://npmjs.com/package/randomized-string | JS | no | chance | no | | [a-z0-9A-Z] | https://npmjs.com/package/meaningful-string | JS | fix | chance | no | | [A-Za-z0-9] | https://npmjs.com/package/generate-unique-id | JS | fix | chance | no | | [custom]{n} | 6K dl https://npmjs.com/package/unique-slug | JS | fix | | no | | [0-9A-H]{4} | 19M dl https://npmjs.com/package/puid-js | JS | fix | | * | | [custom]{n} | https://npmjs.com/package/random-string-gen | JS | fix | | * | | [0-9a-zA-Z]{n} | https://npmjs.com/package/lite-id | JS | fix | | no | | [0-9a-zA-Z_] | https://npmjs.com/package/random-web-token | JS | fix | | no | | [0-9a-zA-Z]{n} | https://npmjs.com/package/uniqider | JS | 16 | | no | | [0-9a-zA-Z]{16} |