How can I do an array on a js constructor function

Question

I want to get the names of all the clients which are stored in a constructor function.

let Client = function(name, feedback){
this.clientName = name;
this.clientFeedback=feedback;
}

let client1 = new Client('Jo', 'Hello')
let client2 = new Client('Mark', 'Bye')

let clientKeys = Object.keys(Client);

For (let i=0; i<clientKeys.length; i++){
Console.log(Client.clientName)}

But this code doesnt work.

Can I use object.keys here?

I'm absolutely beginner, so I hope I'm asking well.

JavaScript is case sensitive, so your For loop and Console aren't going to work. Generally speaking, instantiatable functions (i.e. client) should be uppercase. — Phix
– Phix, Commented Jul 28, 2020 at 21:08
Also, Object.keys(client); will return an empty array as client, since it is a constructor function, it doesn't have keys of its own, only instances like client1 and client2 do — ibrahim mahrir
– ibrahim mahrir, Commented Jul 28, 2020 at 21:12
I think what you actually want is const clients = [client1, client2]; and for (const client of clients) { console.log(client.clientName); } — Bergi
– Bergi, Commented Jul 28, 2020 at 21:13
Also, if you want to get a client name you don't need neither Object.keys nor a for loop, just do console.log(client1.clientName); — ibrahim mahrir
– ibrahim mahrir, Commented Jul 28, 2020 at 21:14

Bergi · Accepted Answer · 2020-07-28 21:14:48Z

2

Can I use Object.keys here?

No. I suspect what you actually want is an array (a list data structure)

const clients = [client1, client2];

and a loop through that:

for (const client of clients) {
    console.log(client.clientName);
}

answered Jul 28, 2020 at 21:14

Bergi

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JCOC611 · Accepted Answer · 2020-07-28 21:13:44Z

2

You're probably thinking of something like this:

function Client(name, feedback) {
    this.name = name;
    this.feedback = feedback;
}

let clients = [
    new Client('jo', 'hello'),
    new Client('mark', 'bye')
];

for (let client of clients)
    console.log(client.name, client.feedback);

The constructor function Client has no "memory" of its instances. Thus, you need to explicitly create an array or some other structure that keeps the references to the instances you are interested in.

answered Jul 28, 2020 at 21:13

JCOC611

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