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@kure

【Go】メソッドの定義方法サンプルメモ

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基本の形

func (<レシーバー>) <関数名>([引数]) [戻り値の型] {
    [関数の本体]
}

サンプル

sample.go
package main

import (
    "fmt"
)

type myInt int

// 引数無し
func (i myInt) plusOne() myInt {
    return i + 1
}

// 引数あり
func (i myInt) plus(j myInt) myInt {
    return i + j
}

// レシーバーの変数名省略(呼び出し元の変数にはアクセスしない)
func (myInt) printHoge() {
    fmt.Println("Hoge")
}

func main() {
    var i myInt = 1
    result := i.plusOne()
    fmt.Println(result) // 2

    var j myInt = 4
    result2 := i.plus(j)
    fmt.Println(result2) // 5

    i.printHoge() // Hoge
}

参考

Go言語 - メソッド - 覚えたら書く https://blog.y-yuki.net/entry/2017/05/05/000000

改訂2版 基礎からわかる Go言語
古川 昇
シーアンドアール研究所 (2015-07-17)
売り上げランキング: 87,346
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