Questions about the usage of pipe in the example of Angular6 official website

in the Angular official website instance, about the login section, you don"t quite understand the usage of pipe:

  login(): Observable<boolean> {
    return of(true).pipe(
      delay(1000),
      tap(val => this.isLoggedIn = true)
    );
  }

check the pipe usage of nodejs, rxjs, and angular itself, and it doesn"t match. Excuse me, can you help me with the answer?

Mar.26,2021

this pipe is the method in rxjs 6 , which is used to integrate various operators, but not if you are looking for rxjs below version 6. (the previous of is also a new usage starting with version 6)

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b22239-2b5ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b22239-2b5ec.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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