Given an array with PR creation and approval times, compute the average duration

pr-times.js

// run this query, for example in https://developer.github.com/v4/explorer/
// query MyQuery {
//   repository(name: "repo-name", owner: "repo-owner") {
//     pullRequests(states: MERGED, last: 100) {
//       nodes {
//         publishedAt
//         reviews(first: 1, states:APPROVED) {
//           nodes {
//             submittedAt
//           }
//         }
//       }
//     }
//   }
// }

// save the nested array of nodes in a variable named c, then:

c.filter(e => e.reviews.nodes[0])
  .map(e => [e.publishedAt, e.reviews.nodes[0].submittedAt])
  .map(e => [e[0], e[1], Date.parse(e[0]), Date.parse(e[1])])
  .map(e => e.concat([e[3] - e[2]])).map(e => e.concat([e[4] / 1000 / 60 / 60]))
  .map(e => e[5])
  .reduce((acc, curr) => acc + curr) / (c.filter(e => e.reviews.nodes[0]).length)