编辑“︁Go 函数式编程概述”︁（章节）

== 实际应用案例 ==

=== 数据处理管道 ===
函数式编程非常适合数据处理任务，如过滤、映射和归约。

<syntaxhighlight lang="go">
package main

import (
    "fmt"
    "strings"
)

func main() {
    words := []string{"go", "rust", "java", "python"}

    // 过滤：长度大于2的单词
    filtered := Filter(words, func(s string) bool {
        return len(s) > 2
    })

    // 映射：转为大写
    mapped := Map(filtered, strings.ToUpper)

    fmt.Println(mapped) // 输出: [RUST JAVA PYTHON]
}

func Filter(vs []string, f func(string) bool) []string {
    var result []string
    for _, v := range vs {
        if f(v) {
            result = append(result, v)
        }
    }
    return result
}

func Map(vs []string, f func(string) string) []string {
    var result []string
    for _, v := range vs {
        result = append(result, f(v))
    }
    return result
}
</syntaxhighlight>

=== 中间件模式 ===
在Web开发中，函数式编程常用于中间件设计。

<syntaxhighlight lang="go">
package main

import "fmt"

type Handler func(string)

func LoggingMiddleware(next Handler) Handler {
    return func(msg string) {
        fmt.Println("Logging:", msg)
        next(msg)
    }
}

func main() {
    handler := func(msg string) {
        fmt.Println("Handler:", msg)
    }

    wrapped := LoggingMiddleware(handler)
    wrapped("Hello") 
    // 输出:
    // Logging: Hello
    // Handler: Hello
}
</syntaxhighlight>