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index.js
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index.js
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// //callbacks
// const fs = require('fs');
// function fileReading(path){
// return new Promise((resolve,reject)=> {
// fs.readFile(path,'utf-8',(err,data)=> {
// if(err){
// reject(err)
// }
// else{
// resolve(data)
// }
// })
// })
// }
// function ok(data){
// console.log(data);
// }
// function notOk(err){
// console.error(err);
// }
// fileReading('t2.txt').then(ok).catch(notOk)
// fileReading('t1.txt').then(ok).catch(notOk)
// class Car{
// constructor(brand){
// this.carName = brand
// }
// present(){
// return `I have a ${this.carName} `
// }
// }
// class Model extends Car{
// constructor(brand,model){
// super(brand)
// this.model = model
// }
// show(){
// console.log(`${this.present()} of model ${this.model}`)
// }
// }
// const mc = new Model("ferrari","mustang");
// mc.show();
// getter setters
// class Cars{
// constructor(brand){
// this._carName = brand
// }
// get carname(){
// return this._carName
// }
// set carname(x){
// this._carName = x
// }
// }
// const myCars = new Cars("ferrari")
// myCars.carname = "gtr"
// console.log(myCars.carname)
// const user = new Map()
// user.set('name','nikhil')
// user.set('age',20)
// console.log(user.get('name'))
// console.log(user)
// console.log(user.size)
// let val = {
// name:"akhil"
// }
// console.log(Object.keys(val).length)
// function rand(resolve){
// setTimeout(resolve,4000)
// }
// let p = new Promise(rand);
// p.then(()=>{console.log("sdf")})
// console.log(p)
// setTimeout(()=>{console.log(p)},7000)
// const arr = ['one','two']
// const str ='hello'
// const ans = str.includes('ll')
// console.log(ans)
// class cars{
// constructor(brand){
// this.c_name = brand
// }
// get cname(){
// return this.c_name
// }
// set cname(x){
// this.c_name = x
// }
// }
// const myCAR = new cars("buggati")
// myCAR.cname = "mmmm"
// console.log(myCAR.cname)
// function random(resolve){
// resolve()
// }
// let p = new Promise(random)
// console.log(p)
//using path lib/package
// const path = require('path')
// console.log("printing path")
// console.log(__dirname)
// console.log("printing new path")
// console.log(path.join(__dirname,"../../index.js"))
//making command
// const fs = require('fs');
// const { Command } = require('commander');
// const program = new Command();
// program
// .name('counter')
// .description('CLI to do file based tasks')
// .version('0.8.0');
// program.command('count')
// .description('Count the number of words in a file')
// .argument('<file>', 'file to count')
// .action((file) => {
// fs.readFile(file, 'utf-8', (err, data) => {
// if (err) {
// console.log(err);
// } else {
// const trimmed = data.trim()
// const lines = trimmed.split(' ').length;
// console.log(`There are ${lines} words in ${file}`);
// }
// });
// });
// program.parse();
function sumofVar(n,m){
return n+m;
}
const express = require('express')
const app = express()
app.use(express.json())
const user = [
{
name:"john",
kidneys:[
{
healthy:false
},
{
healthy:true
},
{
healthy:false
}
]
}
]
app.get('/',function(req,res){
// const johnKidneys = user[0].kidneys;
// const lengthofKidneys = johnKidneys.length
// let noOFhealthyKidneys = 0;
// for(let i = 0;i<lengthofKidneys;i++){
// if(johnKidneys[i].healthy){
// noOFhealthyKidneys=noOFhealthyKidneys+1;
// }
// }
const johnKidneys = user[0].kidneys
const initiallen = johnKidneys.length
const healthy = johnKidneys.filter((kidney) =>
kidney.healthy === true
)
const healthylen = healthy.length
const noOFunhealthyKidneys = initiallen-healthylen;
res.json({
initiallen,
healthylen,
noOFunhealthyKidneys
})
})
app.post('/',function(req,res){
const isHealthy = req.body.isHealthy;
user[0].kidneys.push(
{
healthy:isHealthy
}
)
res.json({
msg:"successfully posted"
})
})
app.put('/',function(req,res){
const isHealthy = req.body.isHealthy;
user[0].kidneys.filter((kidney)=> kidney.healthy = isHealthy)
res.json({
msg:`successfully replaced with ${isHealthy?"healthy":"unhealthy"} kidneys`
})
})
app.delete('/',function(req,res){
const isHealthy = req.body.isHealthy;
user[0].kidneys = user[0].kidneys.filter((kidney)=> kidney.healthy !== isHealthy)
res.json({
msg:`successfully replaced with ${isHealthy?"healthy":"unhealthy"} kidneys`
})
})
app.listen(3000)