@eflexsystems/factory-bot/src/generators/OneOf.js

A factory library for Node.js and JavaScript inspired by factory_girl

import Generator from './Generator.js'

export default class OneOf extends Generator {
  async generate(possibleValues) {
    if (!Array.isArray(possibleValues)) {
      throw new TypeError('Expected an array of possible values')
    }

    if (possibleValues.length === 0) {
      throw new Error('Empty array passed for possible values')
    }

    const size = possibleValues.length
    const randomIndex = Math.floor(Math.random() * size)
    const value = possibleValues[randomIndex]
    return typeof value === 'function' ? value() : value
  }
}