46 строки
964 Б
Go
46 строки
964 Б
Go
package main
|
|
|
|
var testmap1 = map[string]int{"data": 3}
|
|
var testmap2 = map[string]int{
|
|
"one": 1,
|
|
"two": 2,
|
|
"three": 3,
|
|
"four": 4,
|
|
"five": 5,
|
|
"six": 6,
|
|
"seven": 7,
|
|
"eight": 8,
|
|
"nine": 9,
|
|
"ten": 10,
|
|
"eleven": 11,
|
|
"twelve": 12,
|
|
}
|
|
|
|
func main() {
|
|
m := map[string]int{"answer": 42, "foo": 3}
|
|
readMap(m, "answer")
|
|
readMap(testmap1, "data")
|
|
readMap(testmap2, "three")
|
|
readMap(testmap2, "ten")
|
|
delete(testmap2, "six")
|
|
readMap(testmap2, "seven")
|
|
lookup(testmap2, "eight")
|
|
lookup(testmap2, "nokey")
|
|
|
|
// operations on nil maps
|
|
var nilmap map[string]int
|
|
println(m == nil, m != nil, len(m))
|
|
println(nilmap == nil, nilmap != nil, len(nilmap))
|
|
}
|
|
|
|
func readMap(m map[string]int, key string) {
|
|
println("map length:", len(m))
|
|
println("map read:", key, "=", m[key])
|
|
for k, v := range m {
|
|
println(" ", k, "=", v)
|
|
}
|
|
}
|
|
func lookup(m map[string]int, key string) {
|
|
value, ok := m[key]
|
|
println("lookup with comma-ok:", key, value, ok)
|
|
}
|