step2.js

/**
 * Step 1
 * Explain what a datafile is, ie you have one for your project
 *
 * To use optimizely you need to first download your datafile and
 * create an OptimizelySDK instance
 */
// Requesting the datafile and instantiating the SD
const datafileUrl = 'https://cdn.optimizely.com/onboarding/7afe4c97c06f11e38cadf35d39e1180f.json'
const optimizelySDK = require('@optimizely/optimizely-sdk')
const fetch = require('node-fetch')

async function main() {
  /**
   * Step 1 download the datafile and create an instance
   */
  const userId = process.argv[2] || 'yeesheen'
  const resp = await fetch(datafileUrl)
  const datafile = await resp.json()

  const optimizely = optimizelySDK.createInstance({
    datafile,
  });

  /**
   * Step 2
   * Explain what a feature is an make customer use isFeatureEnabled API
   */
  const isEnabled = optimizely.isFeatureEnabled('checkout_flow', userId)
  console.log('isEnabled', isEnabled)

  /**
   * Step 3
   * Use a feature variable
   */
  const message = optimizely.getFeatureVariableString('checkout_flow', 'message', userId)
  console.log('message', message)
}

main()