Golang : How to search a list of records or data structures
Got a newbie that asked me how to search a list of records(data structures) for specific item and below is a simple example on how to search or iterate a list of records using Golang.
What this simple program does is to demonstrate how to iterate through a list of records and look for a specific name that matches the search key. Once the record is found, return the record for further processing.
Here you go!
package main
import (
"fmt"
"strings"
)
type citySize struct {
Name string
Population float64
}
// cities with the largest population in the world
var citiesList = []citySize{
{"Tokyo", 38001000},
{"Delhi", 25703168},
{"Shanghai", 23740778},
{"Sao Paulo", 21066245},
}
func findRecordsByCityName(name string) bool {
for _, v := range citiesList {
// convert to lower case for exact matching
if strings.ToLower(v.Name) == strings.ToLower(name) {
return true
}
}
return false
}
func returnRecordsByCityName(name string) citySize {
for _, v := range citiesList {
// convert to lower case for exact matching
if strings.ToLower(v.Name) == strings.ToLower(name) {
return v
}
}
return citySize{"", 0}
}
func main() {
if !findRecordsByCityName("New York") {
fmt.Println("New York is not in the list!")
}
// Check if Tokyo is in the list
cityData := returnRecordsByCityName("Tokyo")
if cityData.Name != "" {
fmt.Println(cityData)
}
// Check if Teluk Intan is in the list
cityData = returnRecordsByCityName("Teluk Intan")
if cityData.Name != "" {
fmt.Println(cityData)
} else {
fmt.Println("Teluk Intan is not in the list")
}
}
Output:
New York is not in the list!
{Tokyo 3.8001e+07}
Teluk Intan is not in the list
Happy coding!
Reference:
https://www.socketloop.com/tutorials/golang-check-if-item-is-in-slice-array
See also : Golang : How to filter a map's elements for faster lookup
By Adam Ng(黃武俊)
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