英文:
What does type ByKey []mr.KeyValue{} mean?
问题
我完全不了解Go语言，也不知道不同的语言特性何时会一起出现。type ByKey []mr.KeyValue{}，有人可以解释一下这是什么意思吗？
英文:
I am completely new in Go and have no idea when different language features bump up together,
type ByKey []mr.KeyValue{}
could any one please explain what this means?
答案1
得分: 0
如您在golang.org/ref/spec#Types中所见：
类型确定了一组值以及与这些值相关的操作和方法。如果一个类型有名称，可以用类型名称来表示它，否则可以使用类型字面量来指定它，类型字面量由现有类型组成。
类型定义
类型定义创建了一个新的、独立的类型，具有与给定类型相同的基础类型和操作，并将标识符绑定到它上面。
type ByKey []mr.KeyValue 是一个类型定义。它创建了一个名为 ByKey 的新类型，其基础类型是 []mr.KeyValue。KeyValue 是在不同的包中定义的导出类型，作为 mr 导入到当前文件中，该文件包含了 type ByKey []mr.KeyValue。
英文:
As you can see in golang.org/ref/spec#Types
> A type determines a set of values together with operations and methods
> specific to those values. A type may be denoted by a type name, if it
> has one, or specified using a type literal, which composes a type from
> existing types.
And in Type_declarations
> Type definitions
>
> A type definition creates a new, distinct type with
> the same underlying type and operations as the given type, and binds
> an identifier to it.
type ByKey []mr.KeyValue is a type definition. It creates a new type called ByKey with underlying type of []mr.KeyValue. KeyValue is again defined exported type in a different package imported as mr to current file which included type ByKey []mr.KeyValue.
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