Angular2 -根据对象属性的值过滤对象数组

objects = [
  { name: 'John', age: 25 },
  { name: 'Jane', age: 30 },
  { name: 'Bob', age: 35 }
];

<div *ngFor="let obj of objects | filterByAge: 30">
  {{ obj.name }} - {{ obj.age }}
</div>

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'filterByAge'
})
export class FilterByAgePipe implements PipeTransform {
  transform(objects: any[], age: number): any[] {
    return objects.filter(obj => obj.age >= age);
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppComponent } from './app.component';
import { FilterByAgePipe } from './filter-by-age.pipe';

@NgModule({
  declarations: [
    AppComponent,
    FilterByAgePipe
  ],
  imports: [
    BrowserModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }