That's a more readable solutiont than with reg exp

Simple and Сlearly

As for me the best sol., and liberates you from learning REG EXP

It is best practice to create a new variable instead of mutating the original one (string)

Also this code doesn't work if you pass a parentheses combination like that one:
console.log(removeParentheses("((())") //expected to be "(" but not ""

Does not work if you pass the deadline without closing brackets

console.log(removeParentheses("a(b(c")); // a

I used similar to this except in the If statement used a regex to test the case

If there would be a number in the string, for whatever reason, this would fail.
"5" === "5".toUppercase(); // this is true.

Nice solution

This is the first solution that came to my mind 👍🏻

I am reaally sorry :( i TRIED to delete but i couldnt :(

Please, use spoiler flag next time.

and how did I not think of this? Awesome!

I always do the brute force and get schooled in the solution ssection :((((