Facade pattern in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the Facade class constructor.

LLD

class Facade {
    constructor() {
        this.subsystem = new [1]();
    }
}

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AFacade

BSubsystem

CClient

DController

Attempts:

3 left

💡 Hint

Common Mistakes

Using the Facade class itself instead of the Subsystem.

Using unrelated class names like Client or Controller.

The Facade class creates an instance of the Subsystem to simplify client interaction.

2fill in blank

medium

Complete the code to implement a Facade method that calls a subsystem method.

LLD

class Facade {
    operation() {
        return this.subsystem.[1]();
    }
}

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Aexecute

Bstart

Cprocess

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names not defined in the subsystem.

Using generic names that do not exist in the subsystem.

The Facade calls the 'run' method of the subsystem to perform the operation.

3fill in blank

hard

Fix the error in the Facade method to correctly call two subsystem methods.

LLD

class Facade {
    complexOperation() {
        this.subsystem.[1]();
        this.subsystem.[1]();
    }
}

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Ainitialize

Bstart

Cexecute

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using different method names for the two calls.

Using method names that do not exist in the subsystem.

The Facade should call the 'execute' method twice to perform the complex operation.

4fill in blank

hard

Fill both blanks to complete the Facade method that coordinates subsystem methods.

LLD

class Facade {
    coordinate() {
        this.subsystem.[1]();
        this.subsystem.[2]();
    }
}

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Ainitialize

Bstart

Cexecute

Dshutdown

Attempts:

3 left

💡 Hint

Common Mistakes

Reversing the order of initialization and start.

Using shutdown instead of start.

The Facade coordinates by first initializing then starting the subsystem.

5fill in blank

hard

Fill all three blanks to implement a Facade method that manages subsystem lifecycle.

LLD

class Facade {
    lifecycle() {
        this.subsystem.[1]();
        this.subsystem.[2]();
        this.subsystem.[3]();
    }
}

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Ainitialize

Bstart

Cshutdown

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Incorrect order of method calls.

Using initialize instead of execute.

The Facade manages lifecycle by executing, starting, then shutting down the subsystem.