index.js

import express from "express";
import bodyParser from "body-parser";

const app = express();
const port = 4000;

// In-memory data store
let posts = [
  {
    id: 1,
    title: "The Rise of Decentralized Finance",
    content:
      "Decentralized Finance (DeFi) is an emerging and rapidly evolving field in the blockchain industry. It refers to the shift from traditional, centralized financial systems to peer-to-peer finance enabled by decentralized technologies built on Ethereum and other blockchains. With the promise of reduced dependency on the traditional banking sector, DeFi platforms offer a wide range of services, from lending and borrowing to insurance and trading.",
    author: "Alex Thompson",
    date: "2023-08-01, 06:30:31 pm",
  },
  {
    id: 2,
    title: "The Impact of Artificial Intelligence on Modern Businesses",
    content:
      "Artificial Intelligence (AI) is no longer a concept of the future. It's very much a part of our present, reshaping industries and enhancing the capabilities of existing systems. From automating routine tasks to offering intelligent insights, AI is proving to be a boon for businesses. With advancements in machine learning and deep learning, businesses can now address previously insurmountable problems and tap into new opportunities.",
    author: "Mia Williams",
    date: "2023-08-05, 12:14:43 am",
  },
  {
    id: 3,
    title: "Sustainable Living: Tips for an Eco-Friendly Lifestyle",
    content:
      "Sustainability is more than just a buzzword; it's a way of life. As the effects of climate change become more pronounced, there's a growing realization about the need to live sustainably. From reducing waste and conserving energy to supporting eco-friendly products, there are numerous ways we can make our daily lives more environmentally friendly. This post will explore practical tips and habits that can make a significant difference.",
    author: "Samuel Green",
    date: "2023-08-10, 01:06:38 pm",
  },
];

let lastId = 3;

// Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

//Write your code here//

//CHALLENGE 1: GET All posts
app.get("/posts",(req,res)=>{
  res.json(posts);
});
//CHALLENGE 2: GET a specific post by id
app.get("/posts/:id",(req,res)=>{
  const id=parseInt(req.params.id);
  const specificPost=posts.find((p)=>p.id===id);
  if(!specificPost) return res.status(404).json({message: "Post not found."});
  res.json(specificPost);
});
//CHALLENGE 3: POST a new post
app.post("/posts",(req,res)=>{
  const options = { timeZone: 'Asia/Kolkata', hour12: true };
  const currentISTTime = new Date().toLocaleString('en-IN', options);

  const newBlog={
    id: lastId+1,
    title: req.body.title,
    content: req.body.content,
    author: req.body.author,
    date: currentISTTime,
  };
  lastId+=1;
  posts.push(newBlog);
  res.status(201).json(newBlog);
})
//CHALLENGE 4: PATCH a post when you just want to update one parameter
app.patch("/posts/:id",(req,res)=>{
  const id = parseInt(req.params.id);
  const existingPost=posts.find((post)=>post.id===id);
  if (!existingPost) return res.status(404).json({ message: "Post not found" });

  const options = { timeZone: 'Asia/Kolkata', hour12: true };
  const currentISTTime = new Date().toLocaleString('en-IN', options);

  const replacementPost={
    id: id,
    title: req.body.title || existingPost.title,
    content: req.body.content || existingPost.content,
    author: req.body.author || existingPost.author,
    date: currentISTTime,
  };
  const postIndex=posts.findIndex((post)=>post.id===id);
  posts[postIndex]=replacementPost;
  // console.log(posts[postIndex]);
  res.json(posts[postIndex]);
})
//CHALLENGE 5: DELETE a specific post by providing the post id.
app.delete("/posts/:id",(req,res)=>{
  const id = parseInt(req.params.id);
  const searchIndex=posts.findIndex((post)=>post.id===id);
  if(searchIndex>-1){
    posts.splice(searchIndex,1);
    res.sendStatus(200);
  }
  else{
    res.status(404);
    res.json({error: `Joke with id : ${id} not found.
      No jokes were deeted.`});
  }
})
app.listen(port, () => {
  console.log(`API is running at http://localhost:${port}`);
});