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Puzzle 2 Explanation: Map Type

Puzzle 2 Explanation: Map Type

Understand why you can get nil as your output.

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Try it yourself

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

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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 ...