传播操作员模拟 | 传播操作员模拟

本文介绍了传播操作员模拟的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个结构和该结构的实例:

I have a struct and the instance of that struct:

type Obj struct {
  ssid string
  code string
  mit string
  // and other props (23)
}

var ValidObject = Obj {
  ssid: "AK93-KADJ9-92J76",
  code: "SKO-120O"
  mit: "MSLA-923-OKSW"
}

我想创建一个切片结构( Obj )，该切片将包含 ValidObject 且仅更改了某些字段.我认为最好的解释方法是使用伪代码，所以这里是(使用JS的散布运算符)):

I want to create a slice of structs (Obj) which will contain ValidObject with only some fields changed. I think the best way to explain that would be using pseudo code, so here it is (using spread operator from JS :) ):

var slc = []Obj{
  {
    ...ValidObject,
    code: "Other value",
  },
  {
    ...ValidObject,
    mit: "Other value"
  }
}

推荐答案

创建一个辅助函数，该函数需要一个 Object ，更改其 code 并返回新的对象:

Create a helper function that takes an Object, changes its code and returns the new Object:

func withCode(obj Obj, code string) Obj {
    obj.code = code
    return obj
}

请注意， withCode 采用非指针值，因此您传递的 Object 不会被修改，只会修改本地副本.

Note that withCode takes a non-pointer value, so the Object you pass will not be modified, only the local copy.

使用此功能，您的任务是:

And using this your task is:

var slc = []Obj{
    withCode(ValidObject, "Other value"),
    withCode(ValidObject, "Yet another value"),
}
fmt.Println(slc)

输出(在游乐场上尝试):

[{AK93-KADJ9-92J76 Other value MSLA-923-OKSW}
    {AK93-KADJ9-92J76 Yet another value MSLA-923-OKSW}]

该帮助程序 withCode 甚至可以是方法(不是函数).

This helper withCode could even be a method (not a function).

请注意，如果您需要多个字段的变体，最好将它们添加为方法，以便可以链接调用.

Note that if you need to have variations of many fields, it would probably be better to add these as methods, so you can chain the calls.

例如:

func (o Obj) withCode(code string) Obj {
    o.code = code
    return o
}

func (o Obj) withSsid(ssid string) Obj {
    o.ssid = ssid
    return o
}

func (o Obj) withMit(mit string) Obj {
    o.mit = mit
    return o
}

然后使用它:

var slc = []Obj{
    ValidObject.withCode("code2").withSsid("ssid2"),
    ValidObject.withMit("mit2").withSsid("ssid3"),
}
fmt.Println(slc)

输出(在游乐场上尝试):

[{ssid2 code2 MSLA-923-OKSW} {ssid3 SKO-120O mit2}]

这篇关于传播操作员模拟的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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