dedicated pipe for truncating

src/app/app.module.ts

@@ -11,6 +11,7 @@ import { GenderPipe } from './gender.pipe';
 import { ListPaginateComponent } from './list-paginate/list-paginate.component';
 import { ListService } from './list.service';
 import { ListComponent } from './list/list.component';
+import { TruncatePipe } from './truncate.pipe';
 
 @NgModule({
   bootstrap: [AppComponent],
@@ -21,6 +22,7 @@ import { ListComponent } from './list/list.component';
     ListPaginateComponent,
     GenderPipe,
     CustomSortPipe,
+    TruncatePipe,
   ],
   imports: [
     BrowserModule,

src/app/list/list.component.html

@@ -69,7 +69,7 @@
             </div>
           </div>
           <div class="detail">
-            <p>{{ getPersonDetail(person) }}</p>
+            <p>{{ person.intro | truncate:300:true }}</p>
           </div>
         </div>
       </td>

src/app/list/list.component.ts

@@ -67,16 +67,6 @@ export class ListComponent implements OnInit {
     }
   }
 
-  public getPersonDetail(person: IPerson): string {
-    const str = person.intro.replace(/<.*?>/g, '');
-    let words = str.split(' ');
-    if (words.length >= 38) {
-      words = words.slice(0, 37);
-      words[words.length - 1] += '...';
-    }
-    return words.join(' ');
-  }
-
   private getList(): void {
     this.listService.getList().subscribe(
       (data) => {

src/app/truncate.pipe.spec.ts

@@ -0,0 +1,8 @@
+import { TruncatePipe } from './truncate.pipe';
+
+describe('TruncatePipe', () => {
+  it('create an instance', () => {
+    const pipe = new TruncatePipe();
+    expect(pipe).toBeTruthy();
+  });
+});

src/app/truncate.pipe.ts

@@ -0,0 +1,14 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+  name: 'truncate',
+})
+export class TruncatePipe implements PipeTransform {
+  public transform(value: string, limit = 10, words = false, ellipsis = '...'): string {
+    value = value.replace(/<.*?>/g, '');
+    if (words) {
+      limit = value.substr(0, limit).lastIndexOf(' ');
+    }
+    return value.length > limit ? value.substr(0, limit) + ellipsis : value;
+  }
+}