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Range can be used with an array, string, map or channels. During each iteration, range can return one or two values based on the type of collection you are iterating. Following table, provides an overview of what range returns during iteration.
| Range expression | 1st Value | 2nd Value(Optional) |
|---|---|---|
| Array or slice a [n]E | index i int | a[i] E |
| String s string type | index i int | rune int |
| map m map[K]V | key k K | value m[k] V |
| channel c chan E | element e E | none |
Go code range
package main
import "fmt"
func main() {
/* create a slice */
numbers := []int{0, 1, 2, 3, 4, 5, 6, 7, 8}
/* print the numbers */
for i := range numbers {
fmt.Println("Slice item", i, "is", numbers[i])
}
/* create a map*/
countryCapitalMap := map[string]string{"France": "Paris", "Italy": "Rome", "Japan": "Tokyo"}
/* print map using keys*/
for country := range countryCapitalMap {
fmt.Println("Capital of", country, "is", countryCapitalMap[country])
}
/* print map using key-value*/
for country, capital := range countryCapitalMap {
fmt.Println("Capital of", country, "is", capital)
}
}
Reference: https://www.tutorialkart.com
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Vicky Chhetri