Go语言切片(Slice)深度剖析与应用实战

var mySlice []int

mySlice := []int{}

mySlice := make([]int, 5)

slice := make([]int, 5, 10) // 创建一个长度为5，容量为10的整型切片

myStr := []string{"Jack", "Mark", "Nick"} // 创建并初始化一个字符串切片
myNum := []int{10, 20, 30, 40} // 创建并初始化一个整型切片

months := [...]string{"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"}
q2 := months[3:6] // 基于数组创建切片，表示第二季度

mySlice := []int{1, 2, 3, 4, 5}
fmt.Println(mySlice[0]) // 输出: 1

mySlice := []int{1, 2, 3}
mySlice = append(mySlice, 4, 5) // 向切片末尾追加两个元素
fmt.Println(mySlice) // 输出: [1 2 3 4 5]

oldSlice := []int{1, 2, 3, 4, 5}
newSlice := append(oldSlice, 6, 7, 8, 9)
fmt.Println("newSlice len:", len(newSlice), "cap:", cap(newSlice))
// 输出可能会是: newSlice len: 9 cap: 10

firstHalf := months[:6] // 前半年
q1 := firstHalf[:3] // 第一季度

src := []int{1, 2, 3}
dst := make([]int, 2)
copy(dst, src) // 将src的前两个元素复制到dst
fmt.Println(dst) // 输出: [1 2]

slice := []int{1, 2, 3, 4, 5}
for i := 0; i < len(slice); i++ {
    fmt.Println(slice[i])
}

slice := []int{1, 2, 3, 4, 5}
for index, value := range slice {
    fmt.Println(index, value)
}

func sum(numbers []int) int {
    total := 0
    for _, number := range numbers {
        total += number
    }
    return total
}

func main() {
    numbers := []int{1, 2, 3, 4, 5}
    fmt.Println("Sum:", sum(numbers)) // 输出: Sum: 15
}

func findMax(numbers []int) int {
    max := numbers[0]
    for _, number := range numbers {
        if number > max {
            max = number
        }
    }
    return max
}

func main() {
    numbers := []int{3, 5, 2, 8, 1}
    fmt.Println("Max:", findMax(numbers)) // 输出: Max: 8
}

func modifySlice(s []int) {
    s[0] = 100
}

func main() {
    mySlice := []int{1, 2, 3}
    modifySlice(mySlice)
    fmt.Println(mySlice) // 输出: [100 2 3]
}