Explore the practical benefits of functional programming in this 41-minute conference talk from GOTO Copenhagen 2021. Discover how functional programming can help build and maintain high-quality software more efficiently. Learn about performance advantages like caching, precomputing, and parallelizing, as well as development benefits in testing, revising, and debugging. Examine potential drawbacks and ecosystem considerations. Gain insights from Richard Feldman's decade of experience using functional programming professionally and as a hobbyist, comparing it to object-oriented programming. Ideal for pragmatic developers interested in improving their software development practices.