Why constant variables for selecting DOM elements? [duplicate]

Question

Is there a reason as to why we declare the variables as constant while selecting elements from the DOM? I see a lot of devlopers and tutorials use

const form = document.querySelector('form');

Answer 1

You want to store the result so you do not have to query it again. And it is also best practice to use const as often as you can so you cannot accidentally reasign it. In case you DO need to reasign it, it is preferable to use let.