遍历地图的所有键 [英] Iterating over all the keys of a map

问题描述

有没有办法获得Go语言地图中所有键的列表？元素的数量由 len（）给出，但是如果我有像这样的映射：

Is there a way to get a list of all the keys in a Go language map? The number of elements is given by len(), but if I have a map like:

m := map[string]string{ "key1":"val1", "key2":"val2" };

如何迭代所有键？

How do I iterate over all the keys?

推荐答案

https://play.golang.org / p / JGZ7mN0-U-

for k, v := range m { 
    fmt.Printf("key[%s] value[%s]\n", k, v)
}

$对于k：=范围m {
fmt.Printf（key [％]），b $ b

或

or

for k := range m {
    fmt.Printf("key[%s] value[%s]\n", k, m[k])
}

针对语句的语言规范< 指定第一个值是键，第二个变量是值，但不必存在。

Go language specs for for statements specifies that the first value is the key, the second variable is the value, but doesn't have to be present.

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