Making several requests to the Twilio API

index.js

// An array to hold all the promises we get from Twilio API requests
let promises = [];

for (let i = 0; i < 20; i++) {
  // Make a call to the available phone numbers API for the US
  let twilioPromise = client.availablePhoneNumbers('US').local.list({
    areaCode: '650'
  });

  promises.push(twilioPromise);
}

// phonePromise will resolve when all of the promises in the promises array resolve
let phonePromise = Promise.all(promises);