title-length.pipe.ts

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

@Pipe({ name: 'titleLength' })
export class TitleLengthPipe implements PipeTransform {

  transform(title: String): String {
    if (title === null) {
        return '';
    } else if (title.length > 15) {
            return title.substring(0, 15) + '...';
    }
    return title;
  }
}