Clean up the “Creating Pipes” section (#430)

Lots of fixes to the text and code, including making the custom pipe example easier to understand with a `currencyFormat` pipe.

exercises/angular/3a-pipes/problem/.codesandbox/Dockerfile

@@ -0,0 +1 @@
+FROM node:20-bullseye

exercises/angular/3a-pipes/problem/.editorconfig

@@ -0,0 +1,16 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

exercises/angular/3a-pipes/problem/.gitignore

@@ -0,0 +1,42 @@
+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+
+# System files
+.DS_Store
+Thumbs.db

exercises/angular/3a-pipes/problem/README.md

@@ -0,0 +1,27 @@
+# PlaceMyOrder
+
+This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 17.1.0.
+
+## Development server
+
+Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The application will automatically reload if you change any of the source files.
+
+## Code scaffolding
+
+Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
+
+## Build
+
+Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory.
+
+## Running unit tests
+
+Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
+
+## Running end-to-end tests
+
+Run `ng e2e` to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.
+
+## Further help
+
+To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI Overview and Command Reference](https://angular.io/cli) page.

exercises/angular/3a-pipes/problem/angular.json

@@ -0,0 +1,117 @@
+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "place-my-order": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "style": "less",
+          "standalone": false
+        },
+        "@schematics/angular:directive": {
+          "standalone": false
+        },
+        "@schematics/angular:pipe": {
+          "standalone": false
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "pmo",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/place-my-order",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": [
+              "zone.js"
+            ],
+            "tsConfig": "tsconfig.app.json",
+            "inlineStyleLanguage": "less",
+            "assets": [
+              "src/favicon.ico",
+              "src/assets",
+              {
+                "glob": "**/*",
+                "input": "./node_modules/place-my-order-assets/images/",
+                "output": "./assets/images"
+              }
+            ],
+            "styles": [
+              "src/styles.less",
+              "./node_modules/place-my-order-assets/less/styles.less"
+            ],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kb",
+                  "maximumError": "1mb"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "2kb",
+                  "maximumError": "4kb"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "place-my-order:build:production"
+            },
+            "development": {
+              "buildTarget": "place-my-order:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n",
+          "options": {
+            "buildTarget": "place-my-order:build"
+          }
+        },
+        "test": {
+          "builder": "@angular-devkit/build-angular:karma",
+          "options": {
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
+            "tsConfig": "tsconfig.spec.json",
+            "inlineStyleLanguage": "less",
+            "assets": [
+              "src/favicon.ico",
+              "src/assets"
+            ],
+            "styles": [
+              "src/styles.less"
+            ],
+            "scripts": []
+          }
+        }
+      }
+    }
+  },
+  "cli": {
+    "analytics": false
+  }
+}