RxJS publishReplay vs publishLast

Question

I am caching HTTP results in an Angular application. From what I know, both of the following codes work, but I need to know if they do exactly the same thing, or am I missing something important?

publishLast

getPosts() {
    if( !this.posts$ ) {
      this.posts$ = this.http.get('api').publishLast().refCount();
      return this.posts$;
    }

    return this.posts$;
  }

publishReplay

getPosts() {
  if( !this.posts$ ) {
    this.posts$ = this.http.get('api').publishReplay(1).refCount();
       return this.posts$;
  }

  return this.posts$;
}

Answer 1

publishLaststocks (as the name implies) highlights the value of last , which can only be determined when the stream completes .

publishReplay(1)divided by the last emitted value , which is executed after any outlier.

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this.http.get(...) , , .

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