Getting nan while using parseFloat and number with prompt in js

Question

Why parseFloat with prompt outputs nan in js?
Here's the ex...
// Using parseFloat with prompt
const weightInput = prompt("Enter your weight in kg:");
const parsedWeightFloat = parseFloat(weightInput);

console.log("Parsed weight using parseFloat:", parsedWeightFloat);

// Using Number with prompt
const heightInput = prompt("Enter your height in cm:");
const parsedHeightNumber = Number(heightInput);

console.log("Parsed height using Number:", parsedHeightNumber);
// It outputs nan when giving input as strings like "5" etc , parseFloat should check if that string is convertable instead of nan.

Answer 1

let f = ' 5.5 '
let f1 = ' "5.5" '

console.log(parseFloat(f)) //5.5

console.log(parseFloat(f1))//NaN

//prompt adds " " to your prompt input. So there is no need to add it yourself. To see the raw string prompt() returns:

console.log(JSON.stringify(prompt()))

Answer 2

Stefanoo Bob_Li I got it, when I enter a no. with quotation marks in prompt with parseFloat it's parsing the entire strings
since quotes are non-numeric it's giving NaN as output.
thanks:)

Answer 3

I don't get nan.
It seems to work fine.
I testet integer and float.

Answer 4

Bob_Li yes but parseFloat function is designed to handle strings representing numbers, so shouldn't it should parse the numeric part of the string?

Answer 5

"It's strange because I'm still getting NaN. If only there were a way to send a screenshot or some output, I would."

Answer 6

Wow, I never imagined a user would enter quoted numbers or text, unless they r told to do so.
This was pretty interesting.

Answer 7

You can add a screenshot to your feed. You find your feed in the community section.

Answer 8

Niraj Kumar

are you typing

"5"

in the prompt?

you should not add the quotation marks. prompt input are already string by default.

Answer 9

This loop will continue prompting the user for input until a valid number is entered.
you can add additional validation logic to check if the input is NaN and prompt the user again until they provide a valid input

Answer 10

Hii

Answer 11

https://www.sololearn.com/discuss/3263401/?ref=app

Answer 12

Cool guy python

Answer 13

https://sololearn.com/compiler-playground/WUeqDVFPs320/?ref=app
https://sololearn.com/compiler-playground/W3Dqey6X8Jo5/?ref=app
https://sololearn.com/compiler-playground/w7Mb6WIa8cxR/?ref=app
https://sololearn.com/compiler-playground/WiMQSZVahKht/?ref=app
https://sololearn.com/compiler-playground/WJdKtD0j5lLk/?ref=app
https://sololearn.com/compiler-playground/W2Ptc5olf3rZ/?ref=app
https://sololearn.com/compiler-playground/WC6HKPr6Izl1/?ref=app
https://sololearn.com/compiler-playground/cbrhDqfT1rcm/?ref=app