golang怎么判断元素是否在数组中

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    target := 3

    if target in arr {
        fmt.Println("Target found in array")
    } else {
        fmt.Println("Target not found in array")
    }
}

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    target := 3
    found := false

    for _, v := range arr {
        if v == target {
            found = true
            break
        }
    }

    if found {
        fmt.Println("Target found in array")
    } else {
        fmt.Println("Target not found in array")
    }
}

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    target := 3
    elements := make(map[int]bool)

    for _, v := range arr {
        elements[v] = true
    }

    if _, ok := elements[target]; ok {
        fmt.Println("Target found in array")
    } else {
        fmt.Println("Target not found in array")
    }
}