Golang : Detect variable or constant type
Problem :
You have a variable or constant and you want to know which type the variable belongs to.
Solution :
Use the reflect
package. From the overview itself :
A call to ValueOf returns a Value representing the run-time data. Zero takes a Type and returns a Value representing a zero value for that type.
For example :
package main
import (
"fmt"
"reflect"
"strconv"
)
func main() {
var str string = "123456789"
sixtyFour, err := strconv.ParseInt(str, 10, 64) // use base 10 for sanity
if err != nil {
fmt.Println(err)
}
fmt.Printf("The type of str is %v \n", reflect.TypeOf(str))
fmt.Printf("The type of sixtyFour is %v \n", reflect.TypeOf(sixtyFour))
}
Output :
The type of str is string
The type of sixtyFour is int64
Reference :
See also : Golang : Constant and variable names in native language
By Adam Ng
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