github.com/kat-co/vala (go): Package vala is a simple, extensible, library to make argument validation in Go palatable.  This package uses the fluent programming style to provide simultaneously more robust and more terse parameter validation.  Notice how checks can be tiered.  Vala is also extensible. As long as a function conforms to the Checker specification, you can pass it into the Validate method:
Keywords: arguments|go|parameters|validation