package main
func main() {
m := make(map[string]int, 3)
x := len(m)
m["Go"] = m["Go"]
y := len(m)
println(x, y)
}
Choices:
Answer: 0 1
Run it on Go play.
Key points:
make function to create a map, the second argument
is neither the initial length nor the capacity of the result map.
It is just a hint for Go runtime to allocate a large enough backing array
to hold at least the specified number of entries.
m["Go"] = m["Go"] is equivalent to m["Go"] = 0.
After the assignment, the map contains one entry.
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