TypeScript operators.last函数代码示例

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本文整理汇总了TypeScript中rxjs/operators.last函数的典型用法代码示例。如果您正苦于以下问题：TypeScript last函数的具体用法？TypeScript last怎么用？TypeScript last使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了last函数的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的TypeScript代码示例。

示例1: last3

 last3() {
   const source = from([1, 2, 3, 4, 5]);
   // no values will pass given predicate, emit default
   const exampleTwo = source.pipe(last(v => v > 5, -1));
   // output: 'Nothing!'
   const subscribeTwo = exampleTwo.subscribe(val => console.log(val));
 }

开发者ID:zwvista，项目名称:SampleMisc，代码行数:7，代码来源:filtering.service.ts

示例2: upload

  upload(file: File) {
    if (!file) { return; }

    // COULD HAVE WRITTEN:
    // return this.http.post('/upload/file', file, {
    //   reportProgress: true,
    //   observe: 'events'
    // }).pipe(

    // Create the request object that POSTs the file to an upload endpoint.
    // The `reportProgress` option tells HttpClient to listen and return
    // XHR progress events.
    const req = new HttpRequest('POST', '/upload/file', file, {
      reportProgress: true
    });

    // The `HttpClient.request` API produces a raw event stream
    // which includes start (sent), progress, and response events.
    return this.http.request(req).pipe(
      map(event => this.getEventMessage(event, file)),
      tap(message => this.showProgress(message)),
      last(), // return last (completed) message to caller
      catchError(this.handleError(file))
    );
  }

开发者ID:iproduct，项目名称:course-angular，代码行数:25，代码来源:uploader.service.ts

示例3: rule

  return input.pipe(mergeMap(inputTree => {
    const result = rule(inputTree, context);

    if (!result) {
      return observableOf(inputTree);
    } else if (typeof result == 'function') {
      // This is considered a Rule, chain the rule and return its output.
      return callRule(result, observableOf(inputTree), context);
    } else if (isObservable(result)) {
      // Only return the last Tree, and make sure it's a Tree.
      return result.pipe(
        defaultIfEmpty(),
        last(),
        tap(inner => {
          if (!inner || !(TreeSymbol in inner)) {
            throw new InvalidRuleResultException(inner);
          }
        }),
      );
    } else if (TreeSymbol in result) {
      return observableOf(result);
    } else {
      return throwError(new InvalidRuleResultException(result));
    }
  }));

开发者ID:DevIntent，项目名称:angular-cli，代码行数:25，代码来源:call.ts

示例4: rule

  return input.pipe(mergeMap(inputTree => {
    const result = rule(inputTree, context) as object;

    if (result === undefined) {
      return observableOf(inputTree);
    } else if (TreeSymbol in result) {
      return observableOf(result as Tree);
    } else if (isObservable(result)) {
      const obs = result as Observable<Tree>;

      // Only return the last Tree, and make sure it's a Tree.
      return obs.pipe(
        last(),
        tap(inner => {
          if (!(TreeSymbol in inner)) {
            throw new InvalidRuleResultException(inner);
          }
        }),
      );
    } else if (result === undefined) {
      return observableOf(inputTree);
    } else {
      return throwError(new InvalidRuleResultException(result));
    }
  }));

开发者ID:iwe7，项目名称:devkit，代码行数:25，代码来源:call.ts

示例5: last1

 last1() {
   const source = from([1, 2, 3, 4, 5]);
   // no arguments, emit last value
   const example = source.pipe(last());
   // output: "Last value: 5"
   const subscribe = example.subscribe(val => console.log(`Last value: ${val}`));
 }

开发者ID:zwvista，项目名称:SampleMisc，代码行数:7，代码来源:filtering.service.ts

示例6: rule

  return input.pipe(mergeMap(inputTree => {
    const result = rule(inputTree, context) as object;

    if (result === undefined) {
      return observableOf(inputTree);
    } else if (TreeSymbol in result) {
      return observableOf(result as Tree);
    } else if (typeof result == 'function') {
      // This is considered a Rule, chain the rule and return its output.
      return callRule(result, input, context);
    } else if (isObservable(result)) {
      const obs = result as Observable<Tree>;

      // Only return the last Tree, and make sure it's a Tree.
      return obs.pipe(
        last(),
        tap(inner => {
          if (!(TreeSymbol in inner)) {
            throw new InvalidRuleResultException(inner);
          }
        }),
      );
    } else if (result === undefined) {
      return observableOf(inputTree);
    } else {
      return throwError(new InvalidRuleResultException(result));
    }
  }));

开发者ID:fmalcher，项目名称:angular-cli，代码行数:28，代码来源:call.ts

示例7: asDiagram

  asDiagram('last')('should take the last value of an observable', () => {
    const e1 =   hot('--a----b--c--|');
    const e1subs =   '^            !';
    const expected = '-------------(c|)';

    expectObservable(e1.pipe(last())).toBe(expected);
    expectSubscriptions(e1.subscriptions).toBe(e1subs);
  });

开发者ID:MykhailoIskiv，项目名称:rxjs，代码行数:8，代码来源:last-spec.ts

示例8: it

  it('should not return default value if an element is found', () => {
    const e1 = hot('--a---^---b---c---d---|');
    const e1subs =       '^               !';
    const expected =     '----------------(d|)';

    expectObservable(e1.pipe(last(null, 'x'))).toBe(expected);
    expectSubscriptions(e1.subscriptions).toBe(e1subs);
  });

开发者ID:MykhailoIskiv，项目名称:rxjs，代码行数:8，代码来源:last-spec.ts

注：本文中的rxjs/operators.last函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。