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30 lines
859 B
JavaScript
30 lines
859 B
JavaScript
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// This alphabet uses `A-Za-z0-9_-` symbols. The genetic algorithm helped
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// optimize the gzip compression for this alphabet.
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const urlAlphabet =
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'ModuleSymbhasOwnPr-0123456789ABCDEFGHNRVfgctiUvz_KqYTJkLxpZXIjQW';
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/**
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* Generate URL-friendly unique ID. This method uses the non-secure
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* predictable random generator with bigger collision probability.
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* Based on https://github.com/ai/nanoid
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*
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* ```js
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* model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
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* ```
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*
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* @param size Size of the ID. The default size is 21.
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* @returns A random string.
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*/
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function nanoid(size = 21) {
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let id = '';
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// A compact alternative for `for (var i = 0; i < step; i++)`.
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let i = size;
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while (i--) {
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// `| 0` is more compact and faster than `Math.floor()`.
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id += urlAlphabet[(Math.random() * 64) | 0];
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}
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return id;
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}
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module.exports = { nanoid };
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