Can generic functions in Go be nested within each other?

Nested generic functions Generic functions in Go 1.18 allow the creation of functions that apply to multiple types, and nested generic functions can create reusable code hierarchies: generic functions can be nested within each other, creating a Nested code reuse structure. By composing filters and mapping functions into a pipeline, you can create reusable type-safe pipelines. Nested generic functions provide a powerful tool for creating reusable, type-safe code, making your code more efficient and maintainable.

Nested generic functions in Go language

The generic functions introduced in Go 1.18 have brought Go language A powerful new feature. Generic functions allow you to create code that works for multiple types without having to write duplicate functions for each type.

Nested Generic Functions

Go generic functions can be nested within each other, which can create a powerful code reuse hierarchy. For example, you can create a generic function within another generic function as follows:

func Map[T1, T2 any](f func(T1) T2, values []T1) []T2 {
    var result []T2
    for _, element := range values {
        result = append(result, f(element))
    }
    return result
}

func Filter[T1 any](f func(T1) bool, values []T1) []T1 {
    return Map(func(v T1) T1 {
        if f(v) {
            return v
        }
        return zero[T1]()
    }, values)
}

Practical Case

A practical example of nested generic functions The purpose is to create a reusable type-safe pipeline like this:

func Pipe[T1, T2, T3 any](
    f1 func(T1) T2,
    f2 func(T2) T3,
    value T1,
) T3 {
    return f2(f1(value))
}

// 使用管道嵌套组合两个过滤器
filteredAndMapped := Pipe(
    func(v int) bool { return v > 0 }, // 筛选>0的数据
    func(v int) string { return fmt.Sprintf("positive: %d", v) }, // 把剩下的数据映射成字符串
    32, // 管道输入
)

Using this pipeline, you can easily combine multiple generic functions without writing nested loops or conditional checks.

Conclusion

Go's nesting capabilities of generic functions provide a powerful tool for creating reusable, type-safe code. By understanding nested generic functions, you can create more efficient and maintainable Go code.

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