Different ways of iterating over a map in Go (Golang)

Range operator can be used to iterate over a map in Go

Let’s define a map first

sample := map[string]string{
"a": "x",
"b": "y",
}

Iterating over all keys and values

for k, v := range sample {
fmt.Printf("key :%s value: %s\n", k, v)
}

Output:

key :a value: x
key :b value: y

Iterating over only keys

for k := range sample {
fmt.Printf("key :%s\n", k)
}

Output:

key :a
key :b

Iterating over only values

for _, v := range sample {
fmt.Printf("value :%s\n", v)
}

Output:

value :x
value :y

Get list of all keys

keys := getAllKeys(sample)
fmt.Println(keys)
func getAllKeys(sample map[string]string) []string {
var keys []string
for k := range sample {
keys = append(keys, k)
}
return keys
}

Output:

[a b]

golang

iteration