Remember we require console to debug javascript so below will be Node do not logs objects as javasript does after certain level, to do so use, console.log(JSON.stringify(obj, null, 2)); or set require('util').inspect.defaultOptions.depth = null; if...
Errors are handled with exceptions. throw keyword to break normal exectuion of javascript. Node.js has Error class from Error core module. Do, throw Error("My new error message."); or extend class and throw like Class MyCustomError extends Error(){};...
Remember basic meaning. It means choosing only desire sweets from a cakeshop. Here is an example to remember it. const cakeVarieties = ['Chocolate','KitKat','Mango', 'Brownie']; const [myChoise1, myChoise2, ...rest] = cakeVarieties; console.log(myC...
Remember below things first before starting understanding Event Loops. The Node.Js JavaScript Code Runs On A Single Thread. Node.Js Call Stack Is A LIFO (Last In, First Out) Stack. When browser loop through events, it gives priority to callstack an...
Why we need to Understand closure? So we can know where to declare variable and which function in nested level can have access to it. For understanding Closure, please refer below link which has provided best documentation to understand. https://de...
Take it easy as a javascript if else statement that we use every time whether a condition is true or not. If(we got success in something){ return resolution of successs; }else{ return rejection; } As above same a Promise can be defined but remember t...