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Explore the challenges of creating effective abstractions in software development through this 19-minute conference talk from JSConf EU 2019. Delve into the balance between flexibility and ease-of-use when implementing APIs or creating reusable libraries. Learn strategies for navigating time constraints, compromises, and the trial-and-error process to find the optimal level of abstraction. Gain insights on efficiently addressing this often-overlooked third hard problem in software development, alongside naming and cache invalidation.