为不同的go结构创建构造函数

Question

I have a struct which I initiate in some process like following, and this is working as expected.

This is specific runner

type TestRunner struct {
    path string
    name string
}

func NewRunner(p string, n string) *TestRunner {
    return &TestRunner{
        path: p,
        name: n,
    }
}

Now I want in the same package to create another runner so I do it like this e.g.

Also specific runner

type TestRunner2 struct {
    path string
    name string
}

func NewRunner(p string, n string) *TestRunner2 {
    return &TestRunner2{
        path: p,
        name: n,
    }
}

Now I get error that the func NewRunner is exist

I have another file (in the same package) which include the interface

This is generic implementation (different file in the same package)

type Runner interface {
    Run(path string) error         
    ChangePath(newPath string) 
}

So maybe the NewRunner should be there, where its recommended to put the new object ?

obviously I can create NewRunner1 and NewRunner2 method in the file but im not sure if it’s recommended

Answer 1

First, you should name your runners according to their functionality, not by number. FastRunner and SlowRunner or LocalRunner vs RemoteRunner. You get the idea. Then you should create a construct for each one:

func NewFastRunner( ... ) *FastRunner {
    return &FastRunner{ ... }
}

func NewSlowRunner( ... ) *SlowRunner {
    return &SlowRunner{ ... }
}

This is standard practice, and makes for very readable, unambiguous code.