Import golang.org/x/exp/constraints to access generic type constraints like Ordered and Comparable for writing flexible Go functions.
The constraints package is not a standard library package you import; it is an internal package located at golang.org/x/exp/constraints used to define generic type constraints like Comparable and Ordered. To use it, add the dependency to your module and import the specific constraint you need.
import "golang.org/x/exp/constraints"
func Max[T constraints.Ordered](a, b T) T {
if a < b {
return b
}
return a
}
Run go get golang.org/x/exp/constraints to install it.
The constraints package in Go provides reusable rules for generic code, allowing you to write functions that work with any number or comparable type without rewriting logic. Think of it as a toolbox of pre-made templates that tell the compiler which types are allowed to be used in your generic functions. You use it when you want to write flexible code that handles integers, floats, or strings all at once.