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  • Alert
    • Opens a mini window with message
  • Prompt
    • takes input as a string
    • second arg is a default value which will be aleray present in the text field
    •   let a = prompt("Enter value of a ",900);
  • Confirm
    • Asks to confirm and sets true or false
  • We should not use these in UI , use modals Instead
    • extact location and look these are differnet in different browsers
    • These are old methods
    • Blocks the main execution thread , program doesnot continue to next line of code
  •   console.log("hello");
  alert("your script works");
  let a = prompt("Enter value of a ","900");
  a = Number.parseInt(a)
  let write = confirm("Do you want to write it to the page")
  if (write) {
      document.write(a)

  } else {
      document.write("please allow me to write")
  }
  alert("you enter datatype of " + (typeof (a)))