const numbers = [1, 2, 3, 4, 5];

numbers.slice(1, 3);

[2, 3]  

numbers.splice(1, 2);

<button onClick={handleClick()}>
  Click
</button>

<button onClick={handleClick}>
  Click
</button>

const user = {
  name: "Ali",
  age: 22
};

const name = user.name;

const { name } = user;

const { name, age } = user;

const { name: username } = user;

console.log(username);

user?.profile?.name

const name = user.name ?? "Guest";

const { name, age } = user;

const newUser = { ...user, age: 25 };

function greet(name = "Guest") {}

let numbers = [1, 2, 3];
numbers.push(4);

console.log(numbers.length);

Act as a Senior Front-End interviewer.

Conduct a realistic interview.
Ask only one question at a time.

Questions should cover JavaScript, React, CSS, Browser, and Performance.

Do not reveal the correct answer until I respond.

After each answer:

* Give me a score from 0 to 10.
* Point out my mistakes.
* Ask a harder related question.

At the end, tell me how ready I am for a Junior / Mid / Senior position.