An ES6 snippet to total up estimates embedded in Trello cards

TrelloListPointsTotaller.es6

// Paste this into the Chrome Dev Console when on a Trello board
// Estimates are expected to be integers wrapped in square brackets at the start of the card name e.g.
//  "[2] as a developer I want a way to total estimates on Trello cards so I can keep stats"
(() => {
  'use strict'

  class Card {
    static all($scopeElem) {
      return Array.from($scopeElem.querySelectorAll('.list-card')).map(($elem) => {
        return new Card($elem)
      })
    }

    constructor($elem) {
      this.$elem = $elem
    }

    get name() {
      return this.$elem.querySelector('.list-card-title').childNodes[1].textContent
    }

    get estimate() {
      let estimateRegex = /^\[(\d+)\]/
      let match = this.name.match(estimateRegex)

      return (match instanceof Array) ? Number(match[1]) : null
    }
  }

  class List {
    static all() {
      return Array.from(document.querySelectorAll('.list')).map(($elem) => {
        return new List($elem)
      })
    }

    constructor($elem) {
      this.$elem = $elem
    }

    get name() {
      return this.$elem.querySelector('.list-header-name').innerHTML
    }

    get cards() {
      return Card.all(this.$elem)
    }

    get totalPoints() {
      return this.cards.map(card => card.estimate)
                       .filter(estimate => estimate !== null)
                       .reduce((sum, value) => sum + value, 0)
    }
  }

  let lists = List.all()

  console.log(lists.map(list => `${list.totalPoints}, ${list.name}`).join("\n"))
  console.log('Paste the following line into the Google Spreadsheet "Daily Data" sheet')
  console.log(lists.map(list => list.totalPoints).join("\t"))
})()