A simple integer segmentation function

segmentate.ts

// Input: [10, 11, 12, 15, 17]
// Output: [[10, 12], [15, 15], [17, 17]]

// Input [1, 2, 3, 5]
// Output [[1, 3], [5, 5]]

function segmentate(arr: number[]): number[][] {
  const array = [...new Set(arr)].sort((a, b) => a - b);
  const result: number[][] = [];

  let segment: [start: number, end: number] = [array[0], array[0]];
  for (let i = 0; i <= array.length - 1 ; i++) {
    const [curr, next] = [array[i], array[i + 1]];
    
    if (curr + 1 === next) {
      segment = [segment[0], next];
    } else {
      result.push(segment);
      segment = [next, next];
    }
  }
  return result;
}