ng 2 Pipe Example 3: Convert string to Pig Latin

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
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    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

import { PiglatinPipe } from './piglatin.pipe';

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>ng 2 Pipe Example 3: Convert string to Piglatin</h2>
      <p>No pipe: <strong>{{ string }}</strong></p>
      <p>With pipe: <strong>{{ string | piglatin }}</strong></p>
      <p>With pipe, beginning vowel ("{{ string2 }}"): <strong>{{ string2 | piglatin }}</strong></p>
    </div>
  `,
})
export class App {
  
  string: string;
  string2: string;
  
  constructor() {
    this.string = "Lorem";
    this.string2 = "Awesome";
  }
  
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, PiglatinPipe ],
  bootstrap: [ App ]
})
export class AppModule {}

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

@Pipe({name: 'piglatin'})
export class PiglatinPipe implements PipeTransform {
  
  transform(value: string, args: string[]): any {
    let vowels = ["a", "e", "i", "o", "u"]
    if(vowels.indexOf(value[0].toLowerCase()) > -1) {
      return value + 'ay';  
    }
    return value.substring(1,value.length) + value[0].toLowerCase() + 'ay';
  }
  
}