Date range generator

82.7% acceptance

Mar 31, 2026

Given a start date start, an end date end, and a positive integer step, return a generator object that yields dates in the range from start to end inclusive. The value of step indicates the number of days between consecutive yielded values. All yielded dates must be in the string format YYYY-MM-DD.

Solution

TypeScript

Time O(n)

Space O(1)

LeetCode

solution.ts

function* dateRangeGenerator(
  start: string,
  end: string,
  step: number,
): Generator<string> {
  let current = new Date(start);
  const endDate = new Date(end);
  while (current <= endDate) {
  yield current.toISOString().slice(0, 10);
  current.setDate(current.getDate() + step);
  }
}

/**
 * const g = dateRangeGenerator('2023-04-01', '2023-04-04', 1);
 * g.next().value; // '2023-04-01'
 * g.next().value; // '2023-04-02'
 * g.next().value; // '2023-04-03'
 * g.next().value; // '2023-04-04'
 * g.next().done; // true
 */