Expand function for more arguments in JavaScript

Question

I want to know how i can expand function and add more arguments for it like object. For example I have function

function xml(){}

xml.prototype.get = function(url, config /*optional*/){
    //something with restApi
}

and i want to use mock data for every method and i try to add mock and mockData like new parameters in object but if i don't pass config argument all brokes, but i want to use it outside object.

const httpClient = Object.create(xml)
httpClient.get = function(url, config /*optional*/,{mock,mockData}={}){
        if(mock){
          return new Promise(resolve=>resolve({data: mockData}))
        }
        return this.get(url, config)
    }

you can use like this {mock:undefined,mockData:undefined} or you can pass object variable function(url, config /*optional*/,MyObject={}) — Zulqarnain Jalil
– Zulqarnain Jalil, Commented Aug 29, 2019 at 10:54

Code Maniac · Accepted Answer · 2019-08-29 10:54:02Z

2

You can simply have all of the arguments as object property

function dummmy({mock,mockData,url,config}={}){
   if(mock){
      return new Promise(resolve=>resolve({data: mockData}))
    }
  return this.get(url, config)
}

And then pass whatever values you want to pass

dummy({url:'someurl', mock:[1,2,3]})

function dummy( {a,b} = {} ){
  console.log(a,b)
}

dummy({a:1})
dummy({a:1, b:2})

answered Aug 29, 2019 at 10:54

Code Maniac

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Scriptkiddy1337 · Accepted Answer · 2019-08-29 10:55:38Z

0

const httpClient = Object.create(xml)
httpClient.get = function(url, config, mock, mockData) {
    if (!!mock && !mockData) {
        mockData = mock;
        mock = config;
        config = null;
    }
    if(mock){
      return new Promise(resolve=>resolve({data: mockData}))
    }
    return this.get(url, config)
}

answered Aug 29, 2019 at 10:55

Scriptkiddy1337

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