bank-account added

config.json

@@ -25,7 +25,6 @@
     "exemplar": [".meta/exemplar.ts"]
   },
   "exercises": {
-    "concept": [],
     "practice": [
       {
         "slug": "hello-world",
@@ -587,7 +586,6 @@
           "loops",
           "exception_handling",
           "lists",
-          "loops",
           "transforming"
         ]
       },
@@ -1006,7 +1004,6 @@
           "strings"
         ]
       },
-
       {
         "slug": "armstrong-numbers",
         "name": "Armstrong Numbers",
@@ -1033,6 +1030,15 @@
           "text_formatting"
         ]
       },
+      {
+        "slug": "bank-account",
+        "name": "Bank Account",
+        "uuid": "3247f8b4-8b80-4c0b-bc3b-779f7a3eb291",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 3,
+        "topics": ["classes", "conditionals"]
+      },
       {
         "slug": "rotational-cipher",
         "name": "Rotational Cipher",
@@ -1066,8 +1072,8 @@
         "practices": [],
         "prerequisites": [],
         "difficulty": 5,
-        "topics": ["algorithms", "callbacks", "conditionals", "lists"],
-        "status": "deprecated"
+        "status": "deprecated",
+        "topics": ["algorithms", "callbacks", "conditionals", "lists"]
       },
       {
         "slug": "all-your-base",
@@ -1190,57 +1196,56 @@
       }
     ]
   },
-  "concepts": [],
   "key_features": [
     {
-      "icon": "evolving",
       "title": "Evolving",
-      "content": "Typescript is a modern and constantly evolving open-source language supported by Microsoft."
+      "content": "Typescript is a modern and constantly evolving open-source language supported by Microsoft.",
+      "icon": "evolving"
     },
     {
-      "icon": "widely-used",
       "title": "Widely used",
-      "content": "TypeScript is used by many libraries and frameworks, and integrates with JavaScript code as well."
+      "content": "TypeScript is used by many libraries and frameworks, and integrates with JavaScript code as well.",
+      "icon": "widely-used"
     },
     {
-      "icon": "dynamically-typed",
       "title": "Typed JavaScript",
-      "content": "Typescript flexible typing system lets you describe what to expect, supporting gradual adoption."
+      "content": "Typescript flexible typing system lets you describe what to expect, supporting gradual adoption.",
+      "icon": "dynamically-typed"
     },
     {
-      "icon": "multi-paradigm",
       "title": "Use any programming style",
-      "content": "Use prototype-based, object-oriented, functional, or declarative programming styles, and more."
+      "content": "Use prototype-based, object-oriented, functional, or declarative programming styles, and more.",
+      "icon": "multi-paradigm"
     },
     {
-      "icon": "tooling",
       "title": "Consistently Good Tooling",
-      "content": "TS's JavaScript integration is handled by the language itself, enabling its tools and features."
+      "content": "TS's JavaScript integration is handled by the language itself, enabling its tools and features.",
+      "icon": "tooling"
     },
     {
-      "icon": "community",
       "title": "Large Community",
-      "content": "The large number of users makes it easy to find answers, documentation, and libraries."
+      "content": "The large number of users makes it easy to find answers, documentation, and libraries.",
+      "icon": "community"
     }
   ],
   "tags": [
+    "execution_mode/compiled",
     "paradigm/declarative",
     "paradigm/functional",
     "paradigm/imperative",
     "paradigm/object_oriented",
-    "typing/static",
-    "typing/dynamic",
-    "typing/strong",
-    "typing/weak",
-    "execution_mode/compiled",
-    "platform/windows",
-    "platform/mac",
-    "platform/linux",
-    "platform/ios",
     "platform/android",
+    "platform/ios",
+    "platform/linux",
+    "platform/mac",
     "platform/web",
+    "platform/windows",
     "runtime/language_specific",
     "runtime/wasmtime",
+    "typing/dynamic",
+    "typing/static",
+    "typing/strong",
+    "typing/weak",
     "used_for/artificial_intelligence",
     "used_for/backends",
     "used_for/cross_platform_development",

exercises/practice/bank-account/.docs/instructions.md

@@ -0,0 +1,12 @@
+# Instructions
+
+Simulate a bank account supporting opening/closing, withdrawals, and deposits of money.
+Watch out for concurrent transactions!
+
+A bank account can be accessed in multiple ways.
+Clients can make deposits and withdrawals using the internet, mobile phones, etc.
+Shops can charge against the account.
+
+Create an account that can be accessed from multiple threads/processes (terminology depends on your programming language).
+
+It should be possible to close an account; operations against a closed account must fail.

exercises/practice/bank-account/.eslintignore

@@ -0,0 +1,13 @@
+!.meta
+
+# Protected or generated
+.git
+.vscode
+
+# When using npm
+node_modules/*
+
+# Configuration files
+.eslintrc.cjs
+babel.config.cjs
+jest.config.cjs

exercises/practice/bank-account/.eslintrc.cjs

@@ -0,0 +1,38 @@
+module.exports = {
+  root: true,
+  parserOptions: {
+    tsconfigRootDir: __dirname,
+    project: ['./tsconfig.json'],
+  },
+  overrides: [
+    // Student provided files
+    {
+      files: ['*.ts'],
+      excludedFiles: ['.meta/proof.ci.ts', '.meta/exemplar.ts', '*.test.ts'],
+      extends: '@exercism/eslint-config-typescript',
+    },
+    // Exercism given tests
+    {
+      files: ['*.test.ts'],
+      excludedFiles: ['custom.test.ts'],
+      env: {
+        jest: true,
+      },
+      extends: '@exercism/eslint-config-typescript/maintainers',
+    },
+    // Student provided tests
+    {
+      files: ['custom.test.ts'],
+      env: {
+        jest: true,
+      },
+      extends: '@exercism/eslint-config-typescript',
+    },
+    // Exercism provided files
+    {
+      files: ['.meta/proof.ci.ts', '.meta/exemplar.ts', '*.test.ts'],
+      excludedFiles: ['custom.test.ts'],
+      extends: '@exercism/eslint-config-typescript/maintainers',
+    },
+  ],
+}

exercises/practice/bank-account/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": [
+    "therealowenrees"
+  ],
+  "files": {
+    "solution": [
+      "bank-account.ts"
+    ],
+    "test": [
+      "bank-account.test.ts"
+    ],
+    "example": [
+      ".meta/proof.ci.ts"
+    ]
+  },
+  "blurb": "Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!"
+}

exercises/practice/bank-account/.meta/proof.ci.ts

@@ -0,0 +1,42 @@
+export class ValueError extends Error {
+  constructor() {
+    super('Bank account error')
+  }
+}
+
+export class BankAccount {
+  private _isOpen: boolean
+  private _balance: number
+
+  constructor() {
+    this._isOpen = false
+    this._balance = 0
+  }
+
+  open(): void {
+    if (this._isOpen) throw new ValueError()
+    this._isOpen = true
+  }
+
+  close(): void {
+    if (!this._isOpen) throw new ValueError()
+    this._isOpen = false
+    this._balance = 0
+  }
+
+  deposit(amount: number): void {
+    if (!this._isOpen || amount < 0) throw new ValueError()
+    this._balance += amount
+  }
+
+  withdraw(amount: number): void {
+    if (!this._isOpen || amount < 0 || amount > this._balance)
+      throw new ValueError()
+    this._balance -= amount
+  }
+
+  get balance(): number {
+    if (!this._isOpen) throw new ValueError()
+    return this._balance
+  }
+}

exercises/practice/bank-account/.meta/solutions/bank-account.ts

@@ -0,0 +1,42 @@
+export class ValueError extends Error {
+  constructor() {
+    super('Bank account error')
+  }
+}
+
+export class BankAccount {
+  private _isOpen: boolean
+  private _balance: number
+
+  constructor() {
+    this._isOpen = false
+    this._balance = 0
+  }
+
+  open(): void {
+    if (this._isOpen) throw new ValueError()
+    this._isOpen = true
+  }
+
+  close(): void {
+    if (!this._isOpen) throw new ValueError()
+    this._isOpen = false
+    this._balance = 0
+  }
+
+  deposit(amount: number): void {
+    if (!this._isOpen || amount < 0) throw new ValueError()
+    this._balance += amount
+  }
+
+  withdraw(amount: number): void {
+    if (!this._isOpen || amount < 0 || amount > this._balance)
+      throw new ValueError()
+    this._balance -= amount
+  }
+
+  get balance(): number {
+    if (!this._isOpen) throw new ValueError()
+    return this._balance
+  }
+}

exercises/practice/bank-account/.meta/tests.toml

@@ -0,0 +1,61 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[983a1528-4ceb-45e5-8257-8ce01aceb5ed]
+description = "Newly opened account has zero balance"
+
+[e88d4ec3-c6bf-4752-8e59-5046c44e3ba7]
+description = "Single deposit"
+
+[3d9147d4-63f4-4844-8d2b-1fee2e9a2a0d]
+description = "Multiple deposits"
+
+[08f1af07-27ae-4b38-aa19-770bde558064]
+description = "Withdraw once"
+
+[6f6d242f-8c31-4ac6-8995-a90d42cad59f]
+description = "Withdraw twice"
+
+[45161c94-a094-4c77-9cec-998b70429bda]
+description = "Can do multiple operations sequentially"
+
+[f9facfaa-d824-486e-8381-48832c4bbffd]
+description = "Cannot check balance of closed account"
+
+[7a65ba52-e35c-4fd2-8159-bda2bde6e59c]
+description = "Cannot deposit into closed account"
+
+[a0a1835d-faae-4ad4-a6f3-1fcc2121380b]
+description = "Cannot deposit into unopened account"
+
+[570dfaa5-0532-4c1f-a7d3-0f65c3265608]
+description = "Cannot withdraw from closed account"
+
+[c396d233-1c49-4272-98dc-7f502dbb9470]
+description = "Cannot close an account that was not opened"
+
+[c06f534f-bdc2-4a02-a388-1063400684de]
+description = "Cannot open an already opened account"
+
+[0722d404-6116-4f92-ba3b-da7f88f1669c]
+description = "Reopened account does not retain balance"
+
+[ec42245f-9361-4341-8231-a22e8d19c52f]
+description = "Cannot withdraw more than deposited"
+
+[4f381ef8-10ef-4507-8e1d-0631ecc8ee72]
+description = "Cannot withdraw negative"
+
+[d45df9ea-1db0-47f3-b18c-d365db49d938]
+description = "Cannot deposit negative"
+
+[ba0c1e0b-0f00-416f-8097-a7dfc97871ff]
+description = "Can handle concurrent transactions"