Bookmarklet to highlight recent comments in a Hacker News thread

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Bookmarklet to highlight recent comments in a Hacker News thread

I find myself often checking into a thread to see the latest replies, which usually means visually scanning for comments that have "minutes" in the timestamp. I decided to automate this (and a bit extra) with a bookmarklet. Create a new bookmark in your web browser and paste the following into the URL field: javascript:(function() { const cutoffStr = prompt("Highlight posts in the last:", "1 hour"); function millisForStr(s) { const [num, unit] = s.split(' '); const parsedNum = Number(num); return unit.includes('minute') ? parsedNum * 60 * 1000 : unit.includes('hour') ? parsedNum * 60 * 60 * 1000 : unit.includes('day') ? parsedNum * 24 * 60 * 60 * 1000 : NaN; } Array.from(document.querySelectorAll('.age')) .map(el => { const interval = millisForStr(el.innerText); return [el, new Date(Date.now() - interval)]; }) .forEach(([el, date]) => { const cutoff = new Date(Date.now() - millisForStr(cutoffStr)); if (date >= cutoff) { el.parentElement.parentElement.parentElement.style.background = "rgba(255, 215, 0, 0.5)"; } else { el.parentElement.parentElement.parentElement.style.background = null; } }) })(); When clicked, you'll be prompted for a string of the form "1 hour" or "23 minutes" or "2 days", and after submitting you'll see all comments on the current page that fall within that interval highlighted with a gold-colored background. Let me know what you think or if you'd like any other small features!