Typeof +pi gives an error that typeof is not defined at string to number

I changed pi to pi = +pi, then typed console.log (typeof (pi)) and got the same error listed above. I did check to see if typeof worked in the previous code, with the typeof HTMLBadges and CSSBadges as shown in the video. But I got a series of errors when I tried to change pi as shown in the video.

And I did change const pi to let pi and still got the error

Sorry, had to go back to the workspaces, because it has been a while since this occurred.

error: string-to-number.js:11 Uncaught ReferenceError: typof is not defined at string-to-number.js:11

code: const HTMLBadges = prompt('How many HTML badges do you have?'); const CSSBadges = prompt('How many CSS badges do you have?');

const totalBadges = +(HTMLBadges) + +(CSSBadges); console.log(totalBadges); console.log(typeof +(HTMLBadges), typeof +(CSSBadges));

let pi = '3.14' pi = +pi; console.log(typof( pi));