Maps / Zero value of a map / Essential Go
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| Language | Go |
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| Owner | Krzysztof Kowalczyk |
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| Visibility | Public |
package main
import "fmt"
func main() {
var m map[string]string
// you can read read from un-initialized map
fmt.Printf(`m["foo"] = %s`+"\n", m["foo"])
_, ok := m["foo"]
fmt.Printf("ok: %v\n", ok)
// writing to uninitialized map panics
m["foo"] = "bar"
}
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