random/dist/esm/rng-factory.js

Seedable random number generator supporting many common distributions.

import seedrandom from 'seedrandom';
import RNG from './rng';
import RNGFunction from './generators/function';
/**
 * Construct an RNG with variable inputs. Used in calls to Random constructor
 * @param {...*} args - Distribution-specific arguments
 * @return RNG
 *
 * @example
 * new Random(RNGFactory(...args))
 */
export default (...args) => {
    const [arg0 = 'default', ...rest] = args;
    switch (typeof arg0) {
        case 'object':
            if (arg0 instanceof RNG) {
                return arg0;
            }
            break;
        case 'function':
            return new RNGFunction(arg0);
        case 'number':
        case 'string':
            return new RNGFunction(seedrandom(...rest));
    }
    throw new Error(`invalid RNG "${arg0}"`);
};
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