When I first experienced functional programming in Scala, I had some learning curves to get over thanks to years of imperative programming. One of those came when knowing what to do with a collection of items (more generally, this applies to some (all?) monadic types. However, I'm going to resist the urge to contribute to�

Wrappers for methods/interfaces/lambdas throwing checked exceptions for use in functional interfaces - fge/throwing-lambdas

See how you can use state and functions together in Java for caching, lazy initialization and memoization, and creating a counter.

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