About prototype in JS

JavaScript
1

I’m doing the challenge: Change the Prototype to a New Object
Link: https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/object-oriented-programming/change-the-prototype-to-a-new-object/
Its easy to just follow the guide and finish the task like thisimage

and then I change to ES6 style like this and it still run well :))

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image510×509 15.2 KB

but after i change to put prototype in an object like the guidance, it turns out like this

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image690×579 19.2 KB

Can anyone help me with this issue :frowning:
Tks anyway !!

2

I’ve seen this kind of error before when webpack is configured differently – usually meaning they’ve restricted ES6 to strict mode: http://docs.w3cub.com/javascript/strict_mode/