Keys of a map

---

• There is no function to fetch the list of keys.
• We can iterate over the keys and put them in an slice with pre-allocated size.

examples/keys-of-map/keys_of_map.go

package main

import (
    "fmt"
)

func main() {
    scores := map[string]int{"Alma": 23, "Cecilia": 12, "Berta": 78, "David": 37}
    fmt.Println(len(scores))
    fmt.Println(scores)

    names := make([]string, 0, len(scores))
    for name := range scores {
        names = append(names, name)
    }
    fmt.Println(names)
    for _, name := range names {
        fmt.Println(name)
    }
}

4
map[Alma:23 Berta:78 Cecilia:12 David:37]
[Alma Cecilia Berta David]
Alma
Cecilia
Berta
David