Readonly for immutable reactive data in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a readonly reactive object in Vue.

Vue

import { reactive, [1] } from 'vue';
const state = reactive({ count: 0 });
const readonlyState = [1](state);

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Awatch

Bref

Ccomputed

Dreadonly

Attempts:

3 left

💡 Hint

Common Mistakes

Using ref instead of readonly.

Trying to use computed for immutability.

The readonly function creates an immutable reactive object in Vue.

2fill in blank

medium

Complete the code to prevent modification of a reactive object using readonly.

Vue

import { reactive, readonly } from 'vue';
const data = reactive({ name: 'Vue' });
const immutableData = readonly([1]);

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AimmutableData

Bname

Cdata

Dreactive

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the wrong variable like name or immutableData.

Passing reactive function instead of an object.

You pass the reactive object data to readonly to make it immutable.

3fill in blank

hard

Fix the error in the code to correctly create a readonly reactive object.

Vue

import { reactive, [1] } from 'vue';
const state = reactive({ value: 10 });
const frozenState = [1](state);

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Areadonly

Bref

Creactive

Dwatch

Attempts:

3 left

💡 Hint

Common Mistakes

Using ref or reactive instead of readonly.

Not importing readonly from 'vue'.

The function to create an immutable reactive object is readonly.

4fill in blank

hard

Fill both blanks to create a readonly reactive object and try to modify it safely.

Vue

import { reactive, [1] } from 'vue';
const original = reactive({ count: 5 });
const safeCopy = [1](original);
safeCopy.count = 10; // This will [2]

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Areadonly

Bthrow an error

Cdo nothing

Drefuse silently

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking readonly allows silent changes.

Using ref instead of readonly.

Using readonly creates an immutable object. Trying to modify it will throw an error in development.

5fill in blank

hard

Fill all three blanks to create a readonly reactive object, access its property, and explain immutability.

Vue

import { reactive, [1] } from 'vue';
const state = reactive({ message: 'Hello' });
const frozenState = [1](state);
console.log(frozenState.[2]); // Outputs 'Hello'
// Trying to change frozenState.[2] will [3]

Drag options to blanks, or click blank then click option'

Areadonly

Bmessage

Cthrow an error

Dallow change silently

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to change readonly data without error.

Using wrong property names.

readonly makes the reactive object immutable. Accessing properties works normally, but changing them throws an error.