Chrome DevTools declare const variable twice not working All In One

Uncaught TypeError: Assignment to constant variable. ❌

const arr = ['9', '1', '3', '7', '12', '37', '23'];

// re-assignment ❌
arr =  [9, 1, 3, 7, 12, 37, 23];

// Uncaught TypeError: Assignment to constant variable.

solution ✅

re-declare const is OK ✅, but re-assignment const is totally Wrong ❌.

const arr = ['9', '1', '3', '7', '12', '37', '23'];

// re-declare ✅
const arr =  [9, 1, 3, 7, 12, 37, 23];

wrong double re-declare way, no meanings at all!

You can’t redeclare let variables in the same scope in a JavaScript program, this is the designed behavior, it won’t work anywhere.

let name = 'Jack';`
let name = 'John';
// Uncaught SyntaxError: Identifier 'name' has already been declared

let name = 'Jack';

let name = 'John'

https://forum.freecodecamp.org/t/declare-with-let-in-chrome-bug/354865

refs

https://stackoverflow.com/questions/68355442/javascript-let-double-declaration

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From： https://www.cnblogs.com/xgqfrms/p/16737425.html