Grokking Advanced Go
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Generic Methods

The module below has one small program, and its go.mod file names Go 1.26.

module example

go 1.26
package main

import "fmt"

type Page[T any] struct{ Items []T }

func (p Page[T]) Map[U any](f func(T) U) Page[U] {
	var result Page[U]
	for _, v := range p.Items {
		result.Items = append(result.Items, f(v))
	}
	return result
}

func main() {
	cents := Page[int64]{Items: []int64{2500, 1250}}
	fmt.Println(cents.Map(func(c int64) string { return fmt.Sprint(c / 100) }))
}
go build .
# example
./main.go:7:22: generic method requires go1

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