random.js

  _getRandomEnvironment = environments => {
    const randomEnvironmentIndex = () => Math.floor(Math.random() * environments.length);
    let newEnvironmentIndex = randomEnvironmentIndex();
    if (this.state && this.state.hasOwnProperty('environmentIndex') && environments.length > 1) {
      while (newEnvironmentIndex === this.state.environmentIndex) {
        newEnvironmentIndex = randomEnvironmentIndex();
      }
    }
    return newEnvironmentIndex;
  };