Why this slider console is not working as it is supposed to

Question

Set the value of slider to its minimum in one click and watch the console
Why like that?
https://code.sololearn.com/Wlc6bYnMHHgJ/?ref=app

Answer 1

let prevValue = slider.value;

The type of slider.value is string instead of number. So you have to change type to number. You can convert strings to numbers using a unary plus operator as opposed to parseInt() or Number()

let prevValue = parseInt(slider.value);
let prevValue = Number(slider.value);
let prevValue = +slider.value;