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ao-railway
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Railway Oriented Programming in Java
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README.md
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ao-railway
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# ao-railway A library for Railway Oriented Programming with Java. See Scott Wlaschin's talk on the subject for more information: [Scott Wlaschin - Railway Oriented Programming - error handling in functional languages](https://vimeo.com/97344498 "Scott Wlaschin - Railway Oriented Programming - error handling in functional languages"). # Example Result.combine( Result.with(username, "Username cannot be empty"), Result.with(oldPassword, "Old password cannot be empty"), Result.with(newPassword, "New password cannot be empty")) .onSuccess(() -> userRepo.find(username)) .ensure(user -> user.isCorrectPassword(oldPassword), "Invalid password") .onSuccess(user -> user.changePassword(newPassword)) .onSuccess(user -> userRepo.update(user)) .onFailure(() -> logger.error("Password could not be changed")) .map(user -> user); Or start with `com.example.Main` class.
