Why caching reduces response times in Laravel - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to store a value in Laravel cache.

Laravel

Cache::put('key', 'value', [1]);

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

A'60 minutes'

B'forever'

Cnull

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer for duration.

Passing null which means no caching.

The third parameter is the number of minutes to cache the value. Using 60 caches it for one hour.

2fill in blank

medium

Complete the code to retrieve a cached value or run a closure if not cached.

Laravel

$value = Cache::remember('key', 30, function() { return [1]; });

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

Anull

B'default value'

CCache::get('key')

Dnow()

Attempts:

3 left

💡 Hint

Common Mistakes

Returning null which caches nothing.

Calling Cache::get inside the closure causing recursion.

The closure returns the value to cache if the key is missing. Here, it returns 'default value'.

3fill in blank

hard

Fix the error in the code to check if a cache key exists.

Laravel

if (Cache::[1]('user_123')) { return Cache::get('user_123'); }

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

Ahas

Bexists

Ccontains

Dcheck

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exists' which is not a Laravel Cache method.

Using 'contains' or 'check' which do not exist.

The correct method to check if a cache key exists is has.

4fill in blank

hard

Fill both blanks to cache a database query result for 10 minutes.

Laravel

$users = Cache::[1]('users', [2], function() { return DB::table('users')->get(); });

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

Aremember

Bput

C10

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'put' which does not return the cached value.

Using 60 minutes instead of 10.

Use remember to cache the result for 10 minutes.

5fill in blank

hard

Fill all three blanks to remove a cache key and then check if it still exists.

Laravel

Cache::[1]('session_45'); if (!Cache::[2]('session_45')) { return '[3]'; }

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

Aforget

Bhas

Cdeleted

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exists' instead of 'has' to check key.

Returning wrong message string.

forget removes the cache key, has checks existence, and 'deleted' is the message returned.