Search with Curry

curried-search.ts

export class GithubSearchCurryService extends BaseGithubSearch {
  searchClient!: (term: string) => Observable<any>;
  constructor(http: HttpClient) {
    super(http)
  }
    
  /** 
  * Execute a search - calling this consecutively will page through results
  */
  search(term: string) {
    if (!this.searchClient) {
      this.searchClient = this.searchClientFactory();
    }
    return this.searchClient(term);
  }

  /** 
   *  Usage:
   *  ```
   *  const search = this.searchClient(term);
   *  return search(); // returns an observable
   * ```
   */

  private searchClientFactory(): () => Observable<any> {
    const PAGE_SIZE = 30; // default
    let since = 0; // will hold the last userid for pagination
    let term: string;
    let page = 1;
    return (_term?: string) => {
      if(_term) term = _term;
      return this.fetch<GitHubSearchResponse>(this.withSearchUri(term, since, page))
        .pipe(tap({
          next: (response: any) => {
            since = response.items[response.items.length - 1]?.id ?? 0;
            page++;
        }}));
    }
  }

}