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ジェネリクスとは

Golang1.18で導入された機能。
型の安全性は保ちつつ、異なる型を引数で取りうるといったものです。
コードの再利用性の向上が期待できます。

main.go
package main

import "fmt"

// 型パラメータを持つ関数
func Print[T any](s []T) {
    for _, v := range s {
        fmt.Println(v)
    }
}

func main() {
    Print([]int{1, 2, 3})
    Print([]string{"a", "b", "c"})
}

型パラメータとしてTを利用しています。

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