range-overlaps/index.js

Checks whether two ranges/intervals overlap. Returns true or false.

/**
 * @fileOverview Checks whether two intervals/ranges overlap.
 * @author Anton Ivanov <anton@ivanov.hk>
 */

/**
 * Checks whether two intervals/ranges overlap.
 * @param {object} range1
 * @param {number} range1.start
 * @param {number} range1.end
 * @param {object} range2
 * @param {number} range2.start
 * @param {number} range2.end
 * @param {boolean} exclusive - By default the search is inclusive. Set this to
 *  true to perform exclusive search.
 */
function overlaps(range1, range2, exclusive = false) {
  if (exclusive) {
    return range1.start < range2.end && range2.start < range1.end;
  } else {
    return range1.start <= range2.end && range2.start <= range1.end;
  }
}

module.exports = overlaps;