package expvar
Func implements Var by calling the function and formatting the returned value using JSON.
Golang expvar.Func type and String() function usage example
package main
import (
"expvar"
"fmt"
)
func main() {
var x interface{} = `{"employees":[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter", "lastName":"Jones"}
]}`
f := expvar.Func(func() interface{} { return x })
str := f.String()
fmt.Println(str) // JSON value
}
References :
http://golang.org/pkg/expvar/#Func
http://golang.org/pkg/expvar/#Func.String
