How to check if a map is empty in Golang?

When the following code:

m := make(map[string]string)
if m == nil {
    log.Fatal("map is empty")
}

is run, the log statement is not executed, while fmt.Println(m) indicates that the map is empty:

map[]

You can use len:

if len(m) == 0 {
    ....
}

From https://golang.org/ref/spec#Length_and_capacity

len(s) map[K]T map length (number of defined keys)

Stack Overflow Q#35005261, score: 228