feat(challenge): add a pipe challenge serie

apps/pipe-intermediate/src/app/app.component.ts

@@ -0,0 +1,34 @@
+import { NgFor } from '@angular/common';
+import { Component } from '@angular/core';
+
+@Component({
+  standalone: true,
+  imports: [NgFor],
+  selector: 'app-root',
+  template: `
+    <div *ngFor="let person of persons; let index = index; let isFirst = first">
+      {{ showName(person.name, index) }}
+      {{ isAllowed(person.age, isFirst) }}
+    </div>
+  `,
+})
+export class AppComponent {
+  persons = [
+    { name: 'Toto', age: 10 },
+    { name: 'Jack', age: 15 },
+    { name: 'John', age: 30 },
+  ];
+
+  showName(name: string, index: number) {
+    // very heavy computation
+    return `${name} - ${index}`;
+  }
+
+  isAllowed(age: number, isFirst: boolean) {
+    if (isFirst) {
+      return 'always allowed';
+    } else {
+      return age > 25 ? 'allowed' : 'declined';
+    }
+  }
+}