Why it is undefined?

Question

https://code.sololearn.com/W4U0cZ5WUru2/?ref=app
let str="text";
str.someth=2;
console.log(str.someth);

Answer 1

For that, you need to do this.

https://code.sololearn.com/Wl0Z40TTvXCl/?ref=app

Answer 2

If any other confusion please reply me. I am always to help.

Answer 3

The use of String.prototype.someth
Does technically add the property to all strings though.