Filter countries

main.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strconv"
)

type Page struct {
	Data []Country `json:"data,omitempty"`
	TotalPages int `json:"total_pages,omitempty"`
}

type Country struct {
	Population int `json:"population,omitempty"`

}

func ExtractFromJSON (url string) *Page {
	resp, err := http.Get(url)
	if err != nil {
		log.Fatalln(err)
	}

	decoder := json.NewDecoder(resp.Body)

	val := &Page{}
	err = decoder.Decode(val)
	if err != nil {
		log.Fatal(err)
	}
	return val
}

func getCountries(s string,p int) int {
	startURL := "https://jsonmock.hackerrank.com/api/countries/search?name="+s+"&page="

	val := ExtractFromJSON(startURL+"1")

	sum := 0
	for i := 1; i <= val.TotalPages; i++ {

		val := ExtractFromJSON(startURL+strconv.Itoa(i))

		for _, s := range val.Data {
			if s.Population>p {
				sum++
			}
		}
	}
	return sum
}

func main() {
	fmt.Println(getCountries("b", 1000000))
}