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Puzzle 2 Explanation: Map Type

Explore the behavior of Go’s map type, focusing on how nil maps are handled safely. Learn to distinguish between absent keys and zero values using the comma ok idiom, enhancing your ability to write error-free and efficient Go code.

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Try it yourself

Try executing the code below to see the result for yourself.

Go (1.16.5)
package main
import (
	"fmt"
)
func main() {
	var m map[string]int
	fmt.Println(m["Hello"])
}

Explanation

The zero value for an uninitialized map is nil. Some operations on Go’s map type is nil safe, meaning they will work with a nil map without panicking.

Both len ...