unhinged solution to AOC 2024 Day 2 Part 2

thing.js

input
	.split("\n")
	.map(line => line.split(" ").map(n => parseInt(n)))
	.map(report => {
		const buffer = [report]

		for (let i = 0; i < report.length; i++) {
      buffer.push(report.filter((_, j) => j !== i));
    }

		return buffer;
	})
	.map(reports => reports.map(r => r.map((e, i, arr) => i === 0 ? arr[1] - arr[0] : e - arr[i - 1])))
	.map(reports => reports.map(r => r.map((e, i, arr) => {
		if (i == 0) return true
		const l = arr[i - 1]
		if (e > 0 && l < 0) return false
		if (e < 0 && l > 0) return false
		if (Math.abs(e) < 1 || Math.abs(e) > 3) return false
		return true
	})))
	.map(reports => reports.map(r => r.filter(e => e).length === r.length))
	.filter(reports => reports.find(e => e)).length