How to determine data type in golang

Use Go's empty interface:
i.(type) can only be used in switch, the function has no return value

func m_type(i interface{}) {    switch i.(type) {
    case string:
        //...
    case int:
        //...
    }    return}

Use reflection:
reflect.TypeOf(x)

package main

import (
    "fmt"
    "reflect"
)

func main() {
    var x int32 = 20
    fmt.Println("type:", reflect.TypeOf(x))
}

Summary: The first method requires knowing how many types there are, and the second method can be used for any object.

Recommended to study "golang tutorial"

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