Expand in Go

Posted by GoDoc
Public (Editable by Users)

Expand replaces ${var} or $var in the string based on the mapping function. For example, os.ExpandEnv(s) is equivalent to os.Expand(s, os.Getenv).

Go
Edit 
package main

import (
	"fmt"
	"os"
)

func main() {
	mapper := func(placeholderName string) string {
		switch placeholderName {
		case "DAY_PART":
			return "morning"
		case "NAME":
			return "Gopher"
		}

		return ""
	}

	fmt.Println(os.Expand("Good ${DAY_PART}, $NAME!", mapper))
}