2757. 生成循环数组的值

2757. 生成循环数组的值

function* cycleGenerator(
  arr: number[],
  startIndex: number
): Generator<number, void, number> {
  const len = arr.length
  let currentIndex = ((startIndex % len) + len) % len // 处理负的 startIndex

  while (true) {
    const jump = yield arr[currentIndex]

    if (typeof jump === 'number') {
      currentIndex = (((currentIndex + jump) % len) + len) % len
    }
  }
}