What's the difference between const and Object.freeze() in JavaScript?

Answer 1

AGirlHasNoName

const is used to defined constant variable means which value can't be change.

Object.freeze() is used to freeze the object means you can't change anything of that object.

Answer 2

There are a few differences. If you declare a const variable, you can't change the initial value (unlike let and var). If you use an object as the value, you can still change the object's properties and values even though you can't reassign. Example:

// create a const and assign an object as the value
const car = {
colour: "red"
}

// trying to reassign fails
car = {
colour: "blue"
}

// but changing the object's properties and values is fine
car.colour = "blue"
car.year = 2021
console.log(car) // outputs changed object {
colour: "blue",
year: 2021
}

If you had used Object.freeze(car) before trying to change the car object, you would not have been allowed to make changes like above. So trying to change the colour to blue and adding a year property would've failed.

If the car object had a property which had an object or function as the value, you could still change those even after using Object.freeze().

Answer 3

none.

const are just frozen variables by design ^^