api.js

const express = require('express')
const app = express()

// allowed us to do post requests, middleware, will go into more tomorrow
app.use(express.json())

const pokemon = [
    {
        id: 1,
        name: 'pikachu',
    },
    {
        id: 2,
        name: 'raichu',
    },
    {
        id: 52,
        name: 'mewtwo'
    }
]

app.get('/', (req, res) => {
    return res.send('hello world')
})

app.get('/pokemon', (req, res) => {
    return res.send(pokemon)
})

app.post('/pokemon', (req, res) => {
    // res.send(req.body)
    // get params from request body, used for strong params
    const id = req.body.id
    const name = req.body.name
    // push into array
    const poke = {
        id: id,
        name: name
    }
    pokemon.push(poke)
    // send back to user new object created
    return res.send(poke)
})

app.get('/pokemon/:id', (req, res) => {
    const id = parseInt(req.params.id)
    const foundPoke = pokemon.find(poke => poke.id === id)
    if (!foundPoke) {
        return res.status(404).send('sorry pokemon not found')
    }
    return res.send(foundPoke)
})

app.put('/pokemon/:id', (req, res) => {
    // find the object in the json that we need to edit, we do this using params
    const id = parseInt(req.params.id)
    const foundPoke = pokemon.find(poke => poke.id === id)
    // access the name that's sent up as a request, name is the key
    // req.body gives you the body object of the request
    const name = req.body.name
    // assign the name that we've just stored to the foundPoke
    foundPoke.name = name
    if (!foundPoke) {
        return res.status(404).send('sorry pokemon not found')
    }
    // send back the json that we've just updated
    return res.send(foundPoke) 
})

app.delete('pokemon/:id', (req, res) => {
    // find the object in the json that we need to delete, we do this using params
    const id = parseInt(req.params.id)
    const foundPoke = pokemon.find(poke => poke.id === id)
    // send a 404 response if poke doesn't exist
    if (!poke) return res.status(404).send('Pokemon not found!')
    // get the actual index of poke in the array, it's not ordered in index so we can't use id
    const index = pokemon.indexOf(poke)
    // splice (remove) the poke from pokemon using the index we just found, it's like saying at index whatever take 1
    pokemon.splice(index, 1)
    // send the poke as a response, which is kind of weird but works
    return res.send(poke)
})

app.listen(5000, () => console.log('listening on port 5000'))