let user = {
    name: "Ali",
    age: 20
};

const users = [
  { name: "Ali", age: 22 },
  { name: "Sara", age: 16 },
  { name: "Reza", age: 25 }
];

const adults = users.filter(user => user.age >= 18);

console.log(adults);

[
  { name: "Ali", age: 22 },
  { name: "Reza", age: 25 }
]

let arr = [10, 20, 30];
console.log(arr[1]);

fetch("/api/users")

GET

POST

PUT

PATCH

DELETE

200

201

400

401

403

404

500

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>