Size of map (len)

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examples/size-of-map/size_of_map.go

package main

import "fmt"

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

3
4
3