,How do I give an object a name via function argument?

Question

I have a function like this:

function dataSend(type, message) {
  return {
    type: message
  };
};

Which I am using like this:

io.sockets.emit('addToQueue', dataSend('error', 'User not found'));

But when it gets to the client side I get an object that is like

{ type: 'User not found' } instead of { 'error': 'User not found' }

Why is this acting like this? I'm not sure how to fix this any information would be great thanks.

With ES6 you can do `{[type]: message}` – Felix Kling Sep 11 '14 at 01:35 — Felix Kling, Sep 11 '14 at 01:35

score 3 · Answer 1 · answered Sep 10 '14 at 23:26

3

You can't set the key with a variable like that, you'll need bracket notation

function dataSend(type, message) {

   var obj = {};

   obj[type] = message;

   return obj;

};

answered Sep 10 '14 at 23:26

adeneo

score 1 · Answer 2 · answered Sep 10 '14 at 23:26

1

Try this:

function dataSend(type, message) {
  var a={};
  a[type]=message;
  return a;
}

Javascript doesn't require quotes around the property names.

Using {type:message} or {'type':message} produces the same result.

answered Sep 10 '14 at 23:26

Ismael Miguel

Code–only answers aren't liked. You should add an explanation of why the OP failed and why your answer fixes it. – RobG Sep 10 '14 at 23:28
@RobG When you make `{type:message}`, you are creating the property `type`. Javascript doesn't require quotes around the property names. – Ismael Miguel Sep 10 '14 at 23:28
2

I know the answer, I was commenting so you could make this and future answers better. :-) – RobG Sep 10 '14 at 23:31
@RobG Thanks for the tip. I totally had forgotten to do it. – Ismael Miguel Sep 10 '14 at 23:32

2 Answers2