Explore the power of lazy evaluations in functional programming through this comprehensive conference talk. Dive into the concept of efficiency by avoiding unnecessary computations, starting with examples from Haskell and other languages. Learn how to implement lazy evaluations in C# using lambda expressions and the Stream API. Discover the benefits of purity, infinite streams, and polymorphism in functional programming. Gain insights into creating efficient code through lazy evaluations, encapsulation, and proper resource management. Understand the semantics and practical applications of lazy evaluations to enhance your programming skills and create more efficient software solutions.