feat: challenge 54 pipe obs signal (#903)

apps/signal/54-pipe-observable-to-signal/src/app/app.component.ts

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+import { TableComponent } from '@angular-challenges/shared/ui';
+import { AsyncPipe } from '@angular/common';
+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { CurrencyPipe } from './currency.pipe';
+import { ProductRowComponent } from './product-row.component';
+import { products } from './product.model';
+
+@Component({
+  standalone: true,
+  imports: [AsyncPipe, CurrencyPipe, TableComponent, ProductRowComponent],
+  selector: 'app-root',
+  template: `
+    <table [items]="products">
+      <ng-template #header>
+        <tr>
+          @for (col of displayedColumns; track col) {
+            <th>{{ col }}</th>
+          }
+        </tr>
+      </ng-template>
+      <ng-template #body let-product>
+        <tr product-row [product]="product"></tr>
+      </ng-template>
+    </table>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class AppComponent {
+  products = products;
+  displayedColumns = ['name', 'priceA', 'priceB', 'priceC'];
+}

apps/signal/54-pipe-observable-to-signal/src/app/currency.pipe.ts

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+import { inject, Pipe, PipeTransform } from '@angular/core';
+import { map, Observable } from 'rxjs';
+import { CurrencyService } from './currency.service';
+
+@Pipe({
+  name: 'currency',
+  standalone: true,
+})
+export class CurrencyPipe implements PipeTransform {
+  currencyService = inject(CurrencyService);
+
+  transform(price: number): Observable<string> {
+    return this.currencyService.symbol$.pipe(map((s) => `${price}${s}`));
+  }
+}

apps/signal/54-pipe-observable-to-signal/src/app/currency.service.ts

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+import { Injectable } from '@angular/core';
+import { BehaviorSubject, map } from 'rxjs';
+
+export interface Currency {
+  name: string;
+  code: string;
+  symbol: string;
+}
+
+export const currency: Currency[] = [
+  { name: 'Euro', code: 'EUR', symbol: '€' },
+  { name: 'Dollar US', code: 'USD', symbol: 'US$' },
+  { name: 'Dollar Autralien', code: 'AUD', symbol: 'AU$' },
+  { name: 'Livre Sterling', code: 'GBP', symbol: '£' },
+  { name: 'Dollar Canadien', code: 'CAD', symbol: 'CAD' },
+];
+
+@Injectable()
+export class CurrencyService {
+  private code = new BehaviorSubject('EUR');
+
+  readonly code$ = this.code.asObservable();
+  readonly symbol$ = this.code$.pipe(
+    map((code) => currency.find((c) => c.code === code)?.symbol ?? code),
+  );
+
+  public updateCode(code: string) {
+    this.code.next(code);
+  }
+}

apps/signal/54-pipe-observable-to-signal/src/app/product-row.component.ts

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+import { AsyncPipe } from '@angular/common';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  Input,
+} from '@angular/core';
+import { CurrencyPipe } from './currency.pipe';
+import { CurrencyService } from './currency.service';
+import { Product } from './product.model';
+
+@Component({
+  standalone: true,
+  selector: 'tr[product-row]',
+  template: `
+    <td>{{ productInfo.name }}</td>
+    <td>{{ productInfo.priceA | currency | async }}</td>
+    <td>{{ productInfo.priceB | currency | async }}</td>
+    <td>{{ productInfo.priceC | currency | async }}</td>
+  `,
+  imports: [AsyncPipe, CurrencyPipe],
+  providers: [CurrencyService],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ProductRowComponent {
+  protected productInfo!: Product;
+
+  @Input({ required: true }) set product(product: Product) {
+    this.currencyService.updateCode(product.currencyCode);
+    this.productInfo = product;
+  }
+
+  currencyService = inject(CurrencyService);
+}

apps/signal/54-pipe-observable-to-signal/src/app/product.model.ts

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+export interface Product {
+  name: string;
+  priceA: number;
+  priceB: number;
+  priceC: number;
+  currencyCode: string;
+}
+
+export const products: Product[] = [
+  {
+    name: 'bike',
+    priceA: 1000,
+    priceB: 2000,
+    priceC: 2200,
+    currencyCode: 'USD',
+  },
+  { name: 'tent', priceA: 112, priceB: 120, priceC: 41, currencyCode: 'EUR' },
+  {
+    name: 'sofa',
+    priceA: 500,
+    priceB: 422,
+    priceC: 5000,
+    currencyCode: 'EUR',
+  },
+  {
+    name: 'watch',
+    priceA: 50,
+    priceB: 130,
+    priceC: 150,
+    currencyCode: 'AUD',
+  },
+  {
+    name: 'computer',
+    priceA: 1000,
+    priceB: 2200,
+    priceC: 3500,
+    currencyCode: 'GBP',
+  },
+  { name: 'mug', priceA: 10, priceB: 15, priceC: 20, currencyCode: 'EUR' },
+  {
+    name: 'headset',
+    priceA: 100,
+    priceB: 150,
+    priceC: 220,
+    currencyCode: 'CAD',
+  },
+  { name: 'cable', priceA: 5, priceB: 10, priceC: 15, currencyCode: 'EUR' },
+  {
+    name: 'table',
+    priceA: 100,
+    priceB: 20,
+    priceC: 500,
+    currencyCode: 'EUR',
+  },
+];

apps/signal/54-pipe-observable-to-signal/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>signal-pipe-observable-to-signal</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  </head>
+  <body>
+    <app-root></app-root>
+  </body>
+</html>

apps/signal/54-pipe-observable-to-signal/src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+
+bootstrapApplication(AppComponent).catch((err) => console.error(err));

apps/signal/54-pipe-observable-to-signal/src/styles.scss

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* You can add global styles to this file, and also import other style files */
+table {
+  width: 100%;
+}
+
+table thead > tr > th {
+  text-align: left;
+  padding: 1rem 1rem;
+  border: 1px solid #dee2e6;
+  border-width: 0 0 1px 0;
+  font-weight: 700;
+  color: #343a40;
+  background: #f8f9fa;
+  transition: box-shadow 0.2s;
+}
+
+table tbody > tr > td {
+  text-align: left;
+  border: 1px solid #dee2e6;
+  border-width: 0 0 1px 0;
+  padding: 1rem 1rem;
+}