go - 从接收器函数返回数组长度

Question

我有一个数组为:

// Stock file
type Stock []StockLine

并希望获得此数组的长度为:

//Records returns number of records in the stock file
func (s *Stock) Records() int {
    return len(*s)
}

但是返回的输出看起来是地址而不是长度，我得到了:

0x1154420

最低运行示例:

package main

import (
    "fmt"
)

type Stock []StockLine

type StockLine struct {
    Resource string
    Color    string
    Style    string
    Size     string
    Quantity  int64
}

func main() {
    fmt.Println("Hello, playground")
    stock := Stock{}
    stock = append(stock, StockLine{
        Resource :"Shirt",
            Color    :"Blue",
            Style    :"Modern",
            Size     :"XL",
            Quantity :10,
    })
    
    fmt.Printf("%v", stock.Records)
    
}

//Records returns number of records in the stock file
func (s *Stock) Records() int {
    return len(*s)
}

如何返回正确的长度？

Answer 1

fmt.Printf("%v", stock.Records)将打印函数的地址；如果您想要结果，则需要add brackets，即所谓的fmt.Printf("%v", stock.Records())