@js-random/string/module/index.js

A simple and lightweight string randomizer for JavaScript (TypeScript friendly)

const charsPadding = 32;
const charsAmount = 126 - 32;
const defaultSeed = (() => {
    let seed = '';
    for (let char = charsPadding; char <= charsAmount; char++) {
        seed += String.fromCharCode(char);
    }
    return seed;
})();
const defaultFilter = /./;
const defaultLength = 10;
/**
 * Generates random string
 *
 * @param optionsOrLength string's length or object-style options
 * @param seed (optional) a string to be used as a seed for the new random string
 * @param filter to filter the resulting string by
 */
export default function randomString(optionsOrLength, seed, filter) {
    let _length = defaultLength;
    let _filter = defaultFilter;
    let _seed = defaultSeed;
    if (typeof optionsOrLength === 'object') {
        _seed = optionsOrLength.seed || defaultSeed;
        _filter = optionsOrLength.filter || defaultFilter;
        _length = typeof optionsOrLength.length === 'number' ? optionsOrLength.length : defaultLength;
    }
    else if (typeof optionsOrLength === 'number') {
        _length = optionsOrLength;
        _filter = filter || defaultFilter;
        _seed = seed || defaultSeed;
    }
    var result = '';
    for (let i = 0; i < _length; i++) {
        result += _seed.split('')
            .sort(() => Math.random() - 0.5)
            .find(char => _filter.test(char));
    }
    return result;
}
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