JavaScript Program to Validate An Email Id

Program 1

"use strict"
const ps=require("prompt-sync")
const prompt=ps({sigint:true})
// indexof
 let s1="data flair free course indore"
// console.log(s1.indexOf('a',4))   

// // console.log(s1.indexOf('z'))
let email=prompt("Enter your email id: ")
 let m,n
  m=email.indexOf('@')
  if(m==-1)
     console.log("Invalid email id")
  else
  {
    n=email.indexOf('.',m+1)
    if(n==-1)
       console.log("Invalid email id")
    else
    console.log("*********Valid email id*******")
  }