Problems creating an empty constructor, and initializing an array in a class

Question

I have tried moving the array before, after the constructor. I am pretty sure I have the syntax wrong at this point, I have tried researching for quite some time without luck. Any help would be appreciated.

class dataService {
  constructor() {
  }

  //I need to be able to initialize this array of objects and create an empty constructor which does nothing

  var data = [ // Error: Construcotr, method, accessor, or property was expected
  name1 = { name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" },
  name2 = { name: "Bob", gender: "male", address: "555 Hello Street", age: 25, phoneNumber: "123-456-7891" },
  name3 = { name: "Gillian", gender: "female", address: "457 Baker Street", age: 23, phoneNumber: "555-111-999" }
];

getData(numRecords) {
  numRecords = numRecords || undefined;
  if (numRecords == undefined) {
    return data;
  }
};


}

Sorry, I do not get it; why can't you set this.data = [ /* your array data */ ] in the constructor? — secan
– secan, Commented Oct 7, 2020 at 15:07
The requirement was to have the constructor do nothing, so I am unsure if I am allowed to create the array there. But at this point, I don't see another way and it works using what you commented, so will see. — Mitchell Niesar
– Mitchell Niesar, Commented Oct 7, 2020 at 15:10
By the way, you cannot have an array like the one you are trying to code. Either you use an array [{ name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" }, { ... }, { ... }] (without the "name1", "name2", "name3" labels) or you use an object { name1: { name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" }, name2: { ... }, name3: { ... } }. — secan
– secan, Commented Oct 7, 2020 at 15:15
I assume you are referring to some sort of assignement or exercise; can you share it, please? — secan
– secan, Commented Oct 7, 2020 at 15:17

altoqueperro · Accepted Answer · 2020-10-07 15:23:24Z

2

Hey my friend you have several errors on how you define properties of classes, i recommend to you to check out javascript classes

mozilla javscript classes documentation and examples

first you have a mistake on array definition, this is the right way:

  this.data = [ 
  { name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" },
   { name: "Bob", gender: "male", address: "555 Hello Street", age: 25, phoneNumber: "123-456-7891" },
  { name: "Gillian", gender: "female", address: "457 Baker Street", age: 23, phoneNumber: "555-111-999" }
];

Second you can initialize you array on the constructor and assign to the class with the "this" keyword.

I made a working example for you base on your code:

js online example

Peace, mis perros !

edited Oct 7, 2020 at 15:23

answered Oct 7, 2020 at 15:17

altoqueperro

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