add new challenge: ngFor enhance

apps/ng-for-enhance/.browserslistrc

@@ -0,0 +1,16 @@
+# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
+# For additional information regarding the format and rule options, please see:
+# https://github.com/browserslist/browserslist#queries
+
+# For the full list of supported browsers by the Angular framework, please see:
+# https://angular.io/guide/browser-support
+
+# You can see what browsers were selected by your queries by running:
+#   npx browserslist
+
+last 1 Chrome version
+last 1 Firefox version
+last 2 Edge major versions
+last 2 Safari major versions
+last 2 iOS major versions
+Firefox ESR

apps/ng-for-enhance/.eslintrc.json

@@ -0,0 +1,36 @@
+{
+  "extends": ["../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "extends": [
+        "plugin:@nrwl/nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "app",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "app",
+            "style": "kebab-case"
+          }
+        ]
+      }
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nrwl/nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}

apps/ng-for-enhance/README.md

@@ -0,0 +1,47 @@
+<h1>Directive enhance</h1>
+
+## Information
+
+Directive is a very powerful tool only offered by the Angular framework. You can apply the DRY principal by having shared logic inside a directive and applying it to any component you want.
+
+But the real power is that you can enhance an already existing directive which moreover doesn't **belong** to you.
+
+## Statement
+
+In this exercice, we have a want to display a list of persons. If the list is empty, you must display _" the list is empty !! "_.
+
+Currently we have :
+
+```typescript
+    <ng-container *ngIf="persons.length > 0; else emptyList">
+      <div *ngFor="let person of persons">
+        {{ person.name }}
+      </div>
+    </ng-container>
+    <ng-template #emptyList>The list is empty !!</ng-template>
+```
+
+We want to get rid of the ng-container by writing :
+
+```typescript
+    <div *ngFor="let person of persons; empty: emptyList">
+    {{ person.name }}
+    </div>
+    <ng-template #emptyList>The list is empty !!</ng-template>
+```
+
+The goal is to **improve the ngFor directive**
+
+## Submitting your work
+
+1. Fork the project
+2. clone it
+3. npm install
+4. **nx serve ng-for-enhance**
+5. _...work On it_
+6. Commit your work
+7. Submit a PR with a title beginning with **Answer:3** that I will review and other dev can review.
+
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A3+label%3Aanswer" target="_blank"><img src="https://img.shields.io/badge/-Solutions-green" alt="Directive enhance"/></a>
+
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="Twitter"/></a>

apps/ng-for-enhance/project.json

@@ -0,0 +1,87 @@
+{
+  "name": "ng-for-enhance",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "sourceRoot": "apps/ng-for-enhance/src",
+  "prefix": "app",
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:browser",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/ng-for-enhance",
+        "index": "apps/ng-for-enhance/src/index.html",
+        "main": "apps/ng-for-enhance/src/main.ts",
+        "polyfills": "apps/ng-for-enhance/src/polyfills.ts",
+        "tsConfig": "apps/ng-for-enhance/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          "apps/ng-for-enhance/src/favicon.ico",
+          "apps/ng-for-enhance/src/assets"
+        ],
+        "styles": ["apps/ng-for-enhance/src/styles.scss"],
+        "scripts": []
+      },
+      "configurations": {
+        "production": {
+          "budgets": [
+            {
+              "type": "initial",
+              "maximumWarning": "500kb",
+              "maximumError": "1mb"
+            },
+            {
+              "type": "anyComponentStyle",
+              "maximumWarning": "2kb",
+              "maximumError": "4kb"
+            }
+          ],
+          "fileReplacements": [
+            {
+              "replace": "apps/ng-for-enhance/src/environments/environment.ts",
+              "with": "apps/ng-for-enhance/src/environments/environment.prod.ts"
+            }
+          ],
+          "outputHashing": "all"
+        },
+        "development": {
+          "buildOptimizer": false,
+          "optimization": false,
+          "vendorChunk": true,
+          "extractLicenses": false,
+          "sourceMap": true,
+          "namedChunks": true
+        }
+      },
+      "defaultConfiguration": "production"
+    },
+    "serve": {
+      "executor": "@angular-devkit/build-angular:dev-server",
+      "configurations": {
+        "production": {
+          "browserTarget": "ng-for-enhance:build:production"
+        },
+        "development": {
+          "browserTarget": "ng-for-enhance:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "browserTarget": "ng-for-enhance:build"
+      }
+    },
+    "lint": {
+      "executor": "@nrwl/linter:eslint",
+      "options": {
+        "lintFilePatterns": [
+          "apps/ng-for-enhance/**/*.ts",
+          "apps/ng-for-enhance/**/*.html"
+        ]
+      }
+    }
+  },
+  "tags": []
+}

apps/ng-for-enhance/src/app/app.component.ts

@@ -0,0 +1,25 @@
+import { NgFor, NgIf } from '@angular/common';
+import { ChangeDetectionStrategy, Component } from '@angular/core';
+
+interface Person {
+  name: string;
+}
+
+@Component({
+  standalone: true,
+  imports: [NgFor, NgIf],
+  selector: 'app-root',
+  template: `
+    <ng-container *ngIf="persons.length > 0; else emptyList">
+      <div *ngFor="let person of persons">
+        {{ person.name }}
+      </div>
+    </ng-container>
+    <ng-template #emptyList>The list is empty !!</ng-template>
+  `,
+  styles: [],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class AppComponent {
+  persons: Person[] = [];
+}

apps/ng-for-enhance/src/environments/environment.prod.ts

@@ -0,0 +1,3 @@
+export const environment = {
+  production: true,
+};

apps/ng-for-enhance/src/environments/environment.ts

@@ -0,0 +1,16 @@
+// This file can be replaced during build by using the `fileReplacements` array.
+// `ng build` replaces `environment.ts` with `environment.prod.ts`.
+// The list of file replacements can be found in `angular.json`.
+
+export const environment = {
+  production: false,
+};
+
+/*
+ * For easier debugging in development mode, you can import the following file
+ * to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
+ *
+ * This import should be commented out in production mode because it will have a negative impact
+ * on performance if an error is thrown.
+ */
+// import 'zone.js/plugins/zone-error';  // Included with Angular CLI.

apps/ng-for-enhance/src/index.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>NgForEnhance</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/ng-for-enhance/src/main.ts

@@ -0,0 +1,10 @@
+import { enableProdMode } from '@angular/core';
+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+bootstrapApplication(AppComponent).catch((err) => console.error(err));

apps/ng-for-enhance/src/polyfills.ts

@@ -0,0 +1,52 @@
+/**
+ * This file includes polyfills needed by Angular and is loaded before the app.
+ * You can add your own extra polyfills to this file.
+ *
+ * This file is divided into 2 sections:
+ *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
+ *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
+ *      file.
+ *
+ * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
+ * automatically update themselves. This includes recent versions of Safari, Chrome (including
+ * Opera), Edge on the desktop, and iOS and Chrome on mobile.
+ *
+ * Learn more in https://angular.io/guide/browser-support
+ */
+
+/***************************************************************************************************
+ * BROWSER POLYFILLS
+ */
+
+/**
+ * By default, zone.js will patch all possible macroTask and DomEvents
+ * user can disable parts of macroTask/DomEvents patch by setting following flags
+ * because those flags need to be set before `zone.js` being loaded, and webpack
+ * will put import in the top of bundle, so user need to create a separate file
+ * in this directory (for example: zone-flags.ts), and put the following flags
+ * into that file, and then add the following code before importing zone.js.
+ * import './zone-flags';
+ *
+ * The flags allowed in zone-flags.ts are listed here.
+ *
+ * The following flags will work for all browsers.
+ *
+ * (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
+ * (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
+ * (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
+ *
+ *  in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
+ *  with the following flag, it will bypass `zone.js` patch for IE/Edge
+ *
+ *  (window as any).__Zone_enable_cross_context_check = true;
+ *
+ */
+
+/***************************************************************************************************
+ * Zone JS is required by default for Angular itself.
+ */
+import 'zone.js'; // Included with Angular CLI.
+
+/***************************************************************************************************
+ * APPLICATION IMPORTS
+ */

apps/ng-for-enhance/src/styles.scss

@@ -0,0 +1 @@
+/* You can add global styles to this file, and also import other style files */

apps/ng-for-enhance/tsconfig.app.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "types": []
+  },
+  "files": ["src/main.ts", "src/polyfills.ts"],
+  "include": ["src/**/*.d.ts"],
+  "exclude": ["jest.config.ts", "**/*.test.ts", "**/*.spec.ts"]
+}

apps/ng-for-enhance/tsconfig.editor.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["**/*.ts"],
+  "compilerOptions": {
+    "types": []
+  }
+}

apps/ng-for-enhance/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.editor.json"
+    }
+  ],
+  "compilerOptions": {
+    "target": "es2020",
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}

apps/ngrx-1/README.md

@@ -30,8 +30,8 @@ In NgRx, **selectors** is a very powerful tool often **misused**. You should use
 4. **nx serve ngrx-1**
 5. _...work On it_
 6. Commit your work
-7. Submit a PR that I will review and other dev can review.
+7. Submit a PR with a title beginning with **Answer:2** that I will review and other dev can review.
 
-<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A2+label%3Aanswer" target="_blank"><img src="https://img.shields.io/badge/-Solutions-green" alt="Projection"/></a>
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A2+label%3Aanswer" target="_blank"><img src="https://img.shields.io/badge/-Solutions-green" alt="NgRx Effect vs Selector"/></a>
 
-_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="Projection"/></a>
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="twitter"/></a>

apps/projection/README.md

@@ -20,8 +20,8 @@ Implement the City card.
 4. **nx serve projection**
 5. _...work on it_
 6. Commit your work
-7. Submit a PR that I will review and other dev can review.
+7. Submit a PR with a title beginning with **Answer:1** that I will review and other dev can review.
 
 <a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A1+label%3Aanswer" target="_blank"><img src="https://img.shields.io/badge/-Solutions-green" alt="Projection"/></a>
 
-_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="Projection"/></a>
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="twitter"/></a>