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@Pipe({
  name: 'dynamicCase'
})
export class DynamicCasePipe implements PipeTransform {
  constructor() { }

  transform(value: string, args?: any) {
    if (!value) {
      return value;
    }
    switch (args) {
      case DisplayCase.AllCaps:
        return value.toUpperCase();
      case DisplayCase.AllLower:
        return value.toLowerCase();
      case DisplayCase.Title:
        return this.toTitleCase(value);
      default:
        return value;
    }
  }
  private toTitleCase(value: string ) {
    return value.split(/\b/g).map(word => this.titleCaseWord(word)).join('');
  }
  private titleCaseWord(word: string) {
    if (!word) {
      return word;
    }
    return word[0].toUpperCase + word.substr(1).toLowerCase();
  }
}

// the component template
// <h1>Dynamic Case</h1>
// <button (click)="changeCase()">Change Case</button>
// <hr>
// <p>
//   {{"Some text I want piped" | dynamicCase:cfg.caseSetting}}
// </p>