# Koin DSL: module, single, factory

> Koin DSL with module, single and factory in the Mobile Action Pro course.

- URL: https://dantech.academy/en/courses/kotlin-accelerator/engineer-builder/07-dependency-injection/lesson-04-koin-dsl-basics
- Course: [Mobile Action Pro](https://dantech.academy/en/courses/kotlin-accelerator.md)
- Module: Dependency Injection with Koin
- Duration: 25 min
- Difficulty: intermediate
- Access: Enrolled students
- Tiếng Việt: https://dantech.academy/courses/kotlin-accelerator/engineer-builder/07-dependency-injection/lesson-04-koin-dsl-basics.md

## Objectives

- Write a Koin module with module { } and understand that a lambda only runs when someone asks
- Choose single or factory based on the state and resources a class holds
- Bind an implementation to an interface and use a qualifier when a type has two definitions

## In this lesson

1. Lesson Goal
2. Part 1: Declaring With module
3. Part 2: single
4. Part 3: factory
5. Part 4: Bind To An Interface
6. Part 5: Two Definitions Of The Same Type
7. Practice Exercise
8. Code Reading Path
9. Signs To Avoid
10. References
11. Key Points

## Study with an AI agent

The full lesson is for students of this course. Students open the lesson on the web and press **Markdown** to copy all of it, then paste it into Claude, ChatGPT, Cursor or whichever agent you use. Faster: mint a token at `/profile/ai-agents` and your agent reads lessons over MCP.

- [Join the course](https://dantech.academy/en/kotlin-accelerator/checkout)

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- Previous lesson: [Koin Overview (Multiplatform)](https://dantech.academy/en/courses/kotlin-accelerator/engineer-builder/07-dependency-injection/lesson-03-koin-overview.md)
- Next lesson: [Koin ViewModel Scope](https://dantech.academy/en/courses/kotlin-accelerator/engineer-builder/07-dependency-injection/lesson-05-koin-viewmodel-scope.md)