Question

How to merge overlapping ranges (start,end),(start,end) in JavaScript

Answer 1

function mergeRanges(ranges) {
  // Sort by the start of each range
  ranges.sort((a, b) => a[0] - b[0]);

  const merged = [];

  for (const [start, end] of ranges) {
    if (merged.length === 0 || start > merged[merged.length - 1][1]) {
      merged.push([start, end]);
    } else {
      const last = merged.length - 1;
      merged[last][1] = Math.max(merged[last][1], end);
    }
  }

  return merged;
}

const ranges = [
  [302, 447],
  [488, 489],
  [121, 234],
  [200, 421],
  [140, 354]
];

console.log(mergeRanges(ranges));



/*
run:

[ [ 121, 447 ], [ 488, 489 ] ]

*/

 

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