Dates Concept Exercise (Library Fees)

exercises/concept/library-fees/.docs/instructions.md

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+# Instructions
+
+Your friend who works at a library in your city has asked you to extend her library software to automatically calculate late fees.
+
+## 1. Determine if a book was checked out before noon
+
+If a book was checked out before noon, the reader has 29 days to return it. If it was checked out at or after noon, it's 30 days.
+
+```javascript
+beforeNoon("2022-03-18T11:00:00")
+// => false
+```
+
+## 2. Calculate the return date
+
+Based on the checkout datetime, calculate the return date.
+
+The fuction should return a `Date` object, either 29 or 30 days later.
+
+```javascript
+returnDate("2022-03-18T11:00:00")
+// => Sun Apr 17 2022 11:00:00 GMT+0530 (India Standard Time)
+```
+
+_You need not worry about the time zone._
+
+## 3. Determine how late the return of the book was
+
+The library has a flat rate for late returns. To be able to calculate the fee, we need to know how many days after the return date the book was actually returned.
+
+The library tracks both the date and time of the actual return of the book for statistical purposes, but doesn't use the time when calculating late fees.
+
+```javascript
+lateByDays("2022-04-17T11:00:00", "2022-03-24T11:00:00")
+// => 7
+```
+
+## 4. Determine if the book was returned on a Monday
+
+The library has a special offer for returning books on Mondays.
+
+```javascript
+returnOnMonday("2022-03-24T11:00:00")
+// => false
+```
+
+## 5. Calculate the late fee
+
+The library charges $0.50 per day if the book is returned late.
+
+Your function should return the total late fee.
+
+Include the special Monday offer. If you return the book on Monday, your late fee is off by 50%, rounded down.
+
+```javascript
+// TODO: Add Example
+```

exercises/concept/library-fees/.eslintrc

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+{
+    "root": true,
+    "extends": "@exercism/eslint-config-javascript",
+    "env": {
+      "jest": true
+    },
+    "overrides": [
+      {
+        "files": [".meta/proof.ci.js", ".meta/exemplar.js", "*.spec.js"],
+        "excludedFiles": ["custom.spec.js"],
+        "extends": "@exercism/eslint-config-javascript/maintainers"
+      }
+    ]
+  }
+

exercises/concept/library-fees/.gitignore

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+node_modules
+yarn-error.log
+

exercises/concept/library-fees/.npmrc

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+audit=false

exercises/concept/library-fees/LICENSE

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+MIT License
+
+Copyright (c) 2021 Exercism
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

exercises/concept/library-fees/babel.config.js

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+module.exports = {
+    presets: ['@exercism/babel-preset-javascript'],
+    plugins: [],
+  };
+

exercises/concept/library-fees/meta/design.md

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+# Design
+
+## Learning objectives
+
+- how dates/timestamps are represented internally
+- how to create dates with new Date, incl. some of the commonly used - variants
+- `Date.parse()`
+- `Date.now()`
+- getting and setting the date components (`getMonth`/`setMonth` etc.)
+- how to calculate a time difference
+- how to compare dates
+
+## Out of scope
+
+- Introduction to Temporal
+- Internationalization API
+- Third party packages for handling dates
+
+## Concepts
+
+- `dates`
+
+## Prerequisites
+
+- `classes`

exercises/concept/library-fees/package.json

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+{
+    "name": "@exercism/javascript-freelancer-rates",
+    "description": "Exercism concept exercise on numbers",
+    "author": "Derk-Jan Karrenbeld <[email protected]>",
+    "private": true,
+    "license": "MIT",
+    "repository": {
+      "type": "git",
+      "url": "https://github.com/exercism/javascript",
+      "directory": "exercises/concept/freelancer-rates"
+    },
+    "devDependencies": {
+      "@babel/core": "^7.17.10",
+      "@exercism/babel-preset-javascript": "^0.1.2",
+      "@exercism/eslint-config-javascript": "^0.6.0",
+      "@types/jest": "^27.4.0",
+      "@types/node": "^16.11.35",
+      "babel-jest": "^28.1.0",
+      "core-js": "^3.22.5",
+      "eslint": "^8.15.0",
+      "jest": "^28.1.0"
+    },
+    "dependencies": {},
+    "scripts": {
+      "test": "jest ./*",
+      "watch": "jest --watch ./*",
+      "lint": "eslint ."
+    }
+  }
+