findByKey.go

package main

import (
	"log"
	"reflect"
	"os"
)

// Find an object in a slice comparing a KEY (string) and its VALUE (interface{})
func findByKey(objArr interface{}, key string, value interface{}) interface{} {
	if reflect.TypeOf(objArr).Kind() == reflect.Slice {
		arr := reflect.ValueOf(objArr)
		for i := 0; i < arr.Len(); i++ {
			currVal := arr.Index(i)
			if currVal.FieldByName(key).Interface() == value {
				return currVal.Interface()
			}
		}
	}
	return nil
}

type RandomType struct {
	Name string `json:"name"`
	ID   int    `json:"int"`
}

func main() {
	var arrayOfRandom = []RandomType{
		RandomType{
			Name: "Pedro",
			ID:   1,
		},
		RandomType{
			Name: "Bertao",
			ID:   2,
		},
	}

	found := findByKey(arrayOfRandom, "Name", "Pedro")
	if found != nil {
		log.Println("Found ID: ", found.(RandomType).ID)
		log.Println("Found Name: ", found.(RandomType).Name)
	}
	os.Exit(0)

}