index.js

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

const app = express();
const port = 4000;
const currentDate = new Date();

// 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: "2023-08-01T10:00:00Z",
  },
  {
    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: "2023-08-05T14:30:00Z",
  },
  {
    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: "2023-08-10T09:15:00Z",
  },
];

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 foundPost = posts.find((post) => post.id === id);
  res.json(foundPost);
});

//CHALLENGE 3: POST a new post
app.post("/posts", (req, res) => {
  const newPost = {
    id: posts.length + 1,
    title: req.body.title,
    content: req.body.content,
    author: req.body.author,
    date: currentDate,
  };
  posts.push(newPost);
  res.sendStatus(201);
});

//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 index = posts.findIndex((post) => post.id === id);
  if (req.body.author) {
    console.log(req.body.author);
    posts[index].author = req.body.author;
    res.sendStatus(200);
  } else if (req.body.content) {
    console.log(req.body.content);
    posts[index].content = req.body.content;
    res.sendStatus(200);
  } else if (req.body.title) {
    console.log(req.body.title);
    posts[index].title = req.body.title;
    res.sendStatus(200);
  } else {
    res.send("Error");
    res.sendStatus(404);
  }
});

//CHALLENGE 5: DELETE a specific post by providing the post id.
app.delete("/posts/:id", (req, res) => {
  const id = parseInt(req.params.id);
  const index = posts.findIndex((post) => post.id === id);
  if (index > -1) {
    posts.splice(index, 1);
    res.sendStatus(200);
  } else {
    res.send(`Failed to find post with id ${id}`);
    res.sendStatus(404);
  }
});

app.listen(port, () => {
  console.log(`API is running at http://localhost:${port}`);
});