douping5015
2016-11-20 08:27 阅读 91
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golang为什么将类型说明符放在变量名之后?

Just out of curiosity, why does the golang place the type specifier after the variable name like below. Have to? Or happen to?

type person struct {
    name string
    age  int
}

Why not just like this? It's more natural IMHO, and it saves the type keyword.

struct person {
    string name
    int age
}
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1条回答 默认 最新

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    dpm91915 dpm91915 2016-11-20 08:53

    I think the Go programming language follows these principles:

    • declarations start with a keyword, so that the parser can be implemented with a single token look-ahead (like in Pascal)
    • the rest of the declaration follows the English grammar, with every redundant word left out (also like in Pascal, but with fewer keywords)

    Examples:

    • The type Frequency is a map indexed by string, mapping to int
      type Frequency map[string]int
    • The type Point is a struct with two fields, x and y of type int
      type Point struct { x, y int }

    The above sentences focus more on the names than on the types, which makes sense since the names convey more meaning.

    If I had to explain to novice programmers how to write declarations in Go, I would let them first describe it in plain English and then remove every word that might even seem redundant.

    Up to now, I didn't find any contradictions to these rules.

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