go - 如何附加到 slice 指针接收器

Question

我有一个 slice 的类型别名。当 slice 是指针接收器时，我希望能够附加到 slice (或从 slice 中过滤):

package main

import (
    "fmt"
)

type itself []string

func (h itself) appendToItself(test string) {
    h = append(h, test)
}

func main() {
    h := itself{"1", "2"}
    h.appendToItself("3")
    fmt.Println(h, "<- how do I make it [1,2,3]")
}

日志:

[1 2] <- how do I make it [1,2,3]

Answer 1

你需要实际传递一个指针，试试:

package main

import (
    "fmt"
)

type itself []string

func (h *itself) appendToItself(test string) {
    *h = append(*h, test)
}

func main() {
    h := itself{"1", "2"}
    h.appendToItself("3")
    fmt.Println(h, "<- how do I make it [1,2,3]")
}