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Explore how to implement dependency injection systems in functional programming languages through this 48-minute conference talk from Lambda Days 2025. Learn the essential criteria that make dependency injection systems effective and discover practical implementation strategies for languages with limited abstraction support. Examine how to leverage Unison's abilities system—a functional programming language with no meta-programming support—to create a robust dependency injection framework. Understand the challenges of scaling functional applications beyond simple function composition to module-based architectures, and see how effective dependency injection enables easy modification of module graphs in large-scale applications. Gain insights into the concept of "Programmable typeclasses" and their potential applications in functional programming languages like Unison.
