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28 lines
633 B
Markdown
28 lines
633 B
Markdown
# 18.3 映射
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创建： `map1 := make(map[keytype]valuetype)`
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初始化: `map1 := map[string]int{"one": 1, "two": 2}`
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（1）如何使用`for`或者`for-range`遍历一个映射：
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```go
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for key, value := range map1 {
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…
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}
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```
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（2）如何在一个映射中检测键key1是否存在：
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`val1, isPresent = map1[key1]`
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返回值: 键`key1`对应的值或者`0`, `true`或者`false`
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（3）如何在映射中删除一个键：
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`delete(map1, key1)`
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## 链接
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- [目录](directory.md)
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- 上一章：[运算符模板和接口](17.4.md)
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- 下一节：[字符串](18.1.md) |