aoc-2022-day4.js

let sum = 0
for (let i = 0; i < input.length; i++) {
  const [_, s1, e1, s2, e2] = /(\d{1,2})-(\d{1,2}),(\d{1,2})-(\d{1,2})/g.exec(input[i])
  const series1 = Array(Number(e1) - Number(s1) + 1).fill(0).map((_, i) => i + Number(s1))
  const series2 = Array(Number(e2) - Number(s2) + 1).fill(0).map((_, i) => i + Number(s2))

  if (series1.length > series2.length) {
    sum += series2.every(n => series1.includes(n)) ? 1 : 0 // some for 2nd part
  } else {
    sum += series1.every(n => series2.includes(n)) ? 1 : 0 // some for 2nd part
  }
}