Dependency injection framework in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Dependency Injection Framework?

A Dependency Injection Framework is a tool that helps automatically provide the parts (dependencies) a piece of code needs to work, so you don't have to create or find them yourself.

beginner

Why use Dependency Injection Frameworks?

They make code easier to manage, test, and change by separating how parts are created from how they are used, like having a helper who gives you exactly what you need when you need it.

beginner

What is 'injection' in Dependency Injection?

Injection means giving an object the things it needs (dependencies) from outside, instead of the object making them itself. It's like getting tools handed to you instead of buying them yourself.

intermediate

Name three common types of Dependency Injection.

1. Constructor Injection: dependencies are given when creating an object.<br>2. Setter Injection: dependencies are set after the object is created.<br>3. Interface Injection: dependencies are provided through an interface method.

intermediate

How does a Dependency Injection Framework improve testing?

It allows you to easily swap real parts with fake or test parts, so you can check if your code works correctly without needing the full system, like testing a car engine separately before building the whole car.

What does a Dependency Injection Framework mainly do?

A Runs your program faster

B Writes code for you

C Automatically provides required parts to code

D Creates user interfaces

Dependency Injection Frameworks provide the parts (dependencies) your code needs automatically.

Which is NOT a type of Dependency Injection?

A Setter Injection

B Loop Injection

C Interface Injection

D Constructor Injection

Loop Injection is not a recognized type of Dependency Injection.

How does Dependency Injection help with testing?

A By making code run faster

B By generating test data

C By hiding errors automatically

D By allowing easy replacement of parts with test versions

Dependency Injection allows swapping real parts with test parts to simplify testing.

In Dependency Injection, what is 'injection'?

A Giving an object its needed parts from outside

B Writing code inside a function

C Deleting unused code

D Compiling code

Injection means providing dependencies to an object from outside.

Which benefit is NOT typically associated with Dependency Injection Frameworks?

A Automatic UI design

B Easier code management

C Better testing

D More flexible code changes

Dependency Injection Frameworks do not design user interfaces automatically.

Explain in your own words what a Dependency Injection Framework does and why it is useful.

Think about how having someone hand you the tools you need can make your work easier.

Describe the three common types of Dependency Injection and give a simple example for each.

Consider when and how the needed parts are given to an object.