module

Learn to define modules with module { }.

The module block

A module in Koin is the block where dependencies are declared. It is created with module { ... }.

Example: val appModule = module { single { Repository() } }. This module provides the Repository class as a singleton. Modules are usually assigned to a val and connected with startKoin { modules(appModule) }. A module can hold several dependencies. Modules can be split by app section; e.g. a network module, a database module.

Module structure

Inside a module each dependency is declared with a single or factory block. Dependencies can reference each other directly.

Example: module { single { Repository() }; single { Service(get()) } }. Here Service takes Repository via get(). get() asks Koin for the relevant type. Modules can be written as independent pieces. The startKoin call can take several modules; Koin merges them all.

Exercise Define appModule

Define val appModule = module { }. Inside main, print println("Module ready").

Show example solution

val appModule = module {
}

fun main() {
    println("Module ready")
}

Test yourself

Complete the module call

val appModule = ____ {
    single { Repository() }
}

Show answer

val appModule = module {
    single { Repository() }
}

Match module parts

module

Dependency block
single

Singleton
factory

New each time
get

Another dependency
Which is used to get another dependency inside a module?
- fetch()
- get()
- find()
- load()
Show answer

get() — get() fetches another dependency.

Next lesson: single and factory

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