計算外國 YouTuber 底下留言台灣感謝率

thankful-rate.js

function calc () {
  const patterns = [
    {
      regex: /(謝謝|感謝)/,
      description: '普通感謝',
    },
    {
      regex: /謝(.*?)(愛|喜)(.*?)灣/,
      description: '精準感謝',
    },
  ]

  const $allElements = [...document.querySelectorAll('ytd-comment-renderer')]

  const result = patterns.map(({ regex, description }) => {
    const $matchedElements = $allElements.filter(i => {
      return regex.test(i.innerText)
    })
    const matchedComments = $matchedElements.map($el => {
      return $el.querySelector('ytd-expander').innerText
    })

    const rate = $matchedElements.length / $allElements.length
    const rateText = `${(rate * 100).toFixed(2)} % (${$matchedElements.length}則 / ${$allElements.length}則)`

    return { regex, description, rateText, matchedComments }
  })

  console.table(
    result.map(({ regex, description, rateText }) => ({
      regex,
      description,
      rateText,
    }))
  )
  window.result = result
}

function scrollToBottom () {
  window.scrollTo({
    top: document.querySelector('ytd-app').scrollHeight,
  })
}

function toggleRunTask () {
  const key = 'timerIds'

  if (window[key]) {
    window[key].forEach(clearInterval)
    delete window[key]
    console.log('🛑 暫停統計')
  } else {
    window[key] = [
      setInterval(calc, 3000),
      setInterval(scrollToBottom, 250),
    ]
    console.log(`🟢 開始統計\n（執行 \`${arguments.callee.name}()\` 來停止）`)
  }
}

toggleRunTask()