How to use callbacks in node js

async javascript callback nodejs 5 years, 3 months ago

//add.js const add = (p1, p2, callback) => { setTimeout(()=>{ callback(p1+p2); }, 2000) } add(3,5,(sum)=>{ console.log(sum) })

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try to run the file with node
Ex: node add.js

harika

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                            //ex.js
const https = require('https')
const url = "" //Use the url you want to

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harika


                            //server.js
const express = require("express")
const app = express()

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harika


                            //app.js
const path = require("path");
const express = require("express")

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harika


                            const mul = (a, b) => {
  return new Promise((resolve, reject)=>
    setTimeout(()=>{

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harika


                            const mul = (a, b) => {
  return new Promise((resolve, reject)=>
    setTimeout(()=>{

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harika


                            const mul = (a, b) => {
  return new Promise((resolve, reject)=>
    setTimeout(()=>{

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harika


                            const {MongoClient, ObjectID} = require(
const ConnectionURL = "mongodb://127.0.0
const DBName = "koder-mongo-app";

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harika


                            const mongoose = require("mongoose");
mongoose.connect("mongodb://127.0.0.1:27
  useNewUrlParser: true,

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harika


                            //plugin to any test js file and proceed
//This is the best standard to work with
const style = {background:'cyan', color:

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harika


                            import React from 'react'
//No need to give the complete path, rea
//If not exists searches globally

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                            //Basic way
<!DOCTYPE html>
<html>

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                            //State Component
<!DOCTYPE html>
<html>

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                            //Basic way
<!DOCTYPE html>
<html>

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harika


                            import React from 'react'
export default class ToggleComponent ext
  constructor(props){

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                            import React from 'react'
export default class StateProps extends

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                            import React, { Component } from 'react'

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                            async function showAvatar() {

  // read our JSON

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                            //JS Code
function runShellScript(){
    const process = require('child_proce

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                            //Fill

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                            //Parent.js
import React from "react";
import Child from './Child'

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harika

How to use callbacks in node js

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