Import additional TypeScript functions and classes, and update routing in TypeScriptEssentials component

[Vanshika814]

---

name: "📦 Pull Request"
about: Submit changes for review
title: "PR: Added Functions and classes in typescript notes page"
labels: "Enhancement
Level 3
GSSOC 2025
frontend
Hacktoberfest"
assignees: "Vanshika814"

📌 Linked Issue

• Connected to Functions and classes in TypeScript #609 and Modules and NameSpaces and Error Handling in TypeScript Notes #610

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🛠 Changes Made

• Added: Added 7 components in FunctionsClasses/:
  FunctionTypes.jsx, OptionalParameters.jsx, DefaultParameters.jsx, RestParameters.jsx, ClassTypes.jsx, Interfaces.jsx, AbstractClasses.jsx
• Updated: Wired routes and imports in TypeScriptEssentials.jsx

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🧪 Testing

• Ran unit tests (npm test)
• Tested manually (describe below):
  • Test case 1: [Steps + Expected Result]
  • Test case 2: [Steps + Expected Result]

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✅ Checklist

• Created a new branch for PR
• Have stared the repository
• Follows JavaScript Styleguide
• No console warnings/errors
• Commit messages follow Git Guidelines

💡 Additional Notes (If any)

[netlify]

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[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. Thank you @Roshansuthar1105 🙌🏼