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Mutating map #8

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kevinyan815 opened this issue Aug 8, 2019 · 0 comments
Open

Mutating map #8

kevinyan815 opened this issue Aug 8, 2019 · 0 comments

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@kevinyan815
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kevinyan815 commented Aug 8, 2019 •
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  • 插入或者更新map m的元素
m[key] = elem
  • 读取m中key对应的元素
elem = m[key]
  • 从m中删除key对应的元素
delete(m, key)
  • 测试key在m中是否存在
elem, ok = m[key]

如果key在m中，ok的值为true，elem为对应map元素类型的值。否则ok为false，elem为对应map元素类型的零值。

Note: 如果elem和ok未定义可以用短标记的形式赋值

elem, ok := m[key]
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