13.5.17 - groupBy

对数据流进行分组

import { of } from "rxjs"
import { mergeMap, groupBy, toArray } from "rxjs/operators"
of(
  { name: "Sue", age: 25 },
  { name: "Joe", age: 30 },
  { name: "Frank", age: 25 },
  { name: "Sarah", age: 35 }
)
  .pipe(
    groupBy(person => person.age),
    mergeMap(group => group.pipe(toArray()))
  )
  .subscribe(console.log)
// [{name: "Sue", age: 25}, { name: "Frank", age: 25 }]
// [{ name: "Joe", age: 30 }]
// [{ name: "Sarah", age: 35 }]