Design a key-value store in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main component of a key-value store system.

HLD

class [1]Store:
    def __init__(self):
        self.store = {}

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

ACache

BDatabase

CKeyValue

DFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using generic names like Database or Cache which are broader concepts.

The main component is called a KeyValueStore because it stores data as key-value pairs.

2fill in blank

medium

Complete the code to add a method that stores a value by key.

HLD

def put(self, [1], value):
    self.store[key] = value

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Adata

Bitem

Cvalue

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'item' or 'data' which do not match the internal usage.

The method parameter should be named 'key' to represent the key where the value is stored.

3fill in blank

hard

Fix the error in the method that retrieves a value by key.

HLD

def get(self, [1]):
    return self.store.get(key, None)

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Akey

Bvalue

Citem

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using parameter names that do not match the variable used inside the method.

The parameter must be named 'key' to match the usage inside the method.

4fill in blank

hard

Fill both blanks to implement a method that deletes a key-value pair safely.

HLD

def delete(self, [1]):
    if [2] in self.store:
        del self.store[key]

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Akey

Bvalue

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causing errors or undefined variables.

Both blanks should be 'key' to check and delete the key from the store.

5fill in blank

hard

Fill all three blanks to implement a method that returns all keys with values greater than a threshold.

HLD

def keys_above(self, [1]):
    return [k for k, v in self.store.items() if v [2] [3]]

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

Athreshold

B>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators or mismatched variable names.

The method takes a threshold, and returns keys where values are greater than the threshold.