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