| 1 | const {
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| 2 | shuffle,
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| 3 | toUpper,
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| 4 | floor,
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| 5 | } = require('lodash');
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| 6 |
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| 7 | const underscore = '_';
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| 8 | const numbers = '0123456789';
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| 9 | const letters = 'abcdefghijklmnopqrstuvwxyz';
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| 10 | const upperLetters = toUpper(letters);
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| 11 | const stringSet = `${underscore}${numbers}${letters}${upperLetters}`;
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| 12 | const stringSetLength = stringSet.length;
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| 13 |
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| 14 | module.exports = (len = 7) => {
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| 15 | if (len < 1) {
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| 16 | return '';
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| 17 | }
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| 18 | let delta = floor(len / stringSetLength);
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| 19 | let str = stringSet;
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| 20 | while (delta--) {
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| 21 | str += str;
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| 22 | }
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| 23 | return shuffle(str.split('')).slice(0, len).join('');
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| 24 | };
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