[RxJS] Remember previous value by using pairwise operator

时间：2020-04-08 17:49:06 收藏：0 阅读：82

pairwise() will remember the last emit value.

const src = interval(1000)
  .pipe(
    pairwise(),
    scan((acc, [prev, curr]) => {
      console.log(prev, curr)
      return acc + curr;
    }, 0)
  ).subscribe() // 0 1

原文：https://www.cnblogs.com/Answer1215/p/12660363.html