Time/date (timestamps) segments overlap in Ramda

isOverlaping.js

/**
 * @see: https://gist.github.com/Tymek/10282cfecebdc16c962baf98e0314a57
 */

const {
  apply,
  compose,
  lt,
  max,
  min,
  transpose,
  unapply,
  useWith,
} = require('ramda')

// props: ([start1, end1], [start2, end2])
// @see https://stackoverflow.com/q/325933/1729641
const isOverlaping = compose(
  apply(
    useWith(
      lt,
      [
        apply(max),
        apply(min),
      ],
    )
  ),
  unapply(transpose),
)

console.assert(isOverlaping([1, 2], [3, 4]) === false, 'divergent 1')
console.assert(isOverlaping([3, 4], [1, 2]) === false, 'divergent 2')

console.assert(isOverlaping([1, 2], [2, 3]) === false, 'adjacent 1')
console.assert(isOverlaping([2, 3], [1, 2]) === false, 'adjacent 2')

console.assert(isOverlaping([1, 2], [1, 2]) === true, 'equivalent')

console.assert(isOverlaping([1, 3], [2, 4]) === true, 'intersecting 1')
console.assert(isOverlaping([2, 4], [1, 3]) === true, 'intersecting 2')

console.assert(isOverlaping([1, 4], [2, 3]) === true, 'contained 1')
console.assert(isOverlaping([2, 3], [1, 4]) === true, 'contained 2')
console.assert(isOverlaping([3, 4], [1, 4]) === true, 'contained 3')
console.assert(isOverlaping([1, 4], [1, 2]) === true, 'contained 4')

module.exports = isOverlaping