Using variable name in JS object?

Question

I defined a variable which will get user's input:

var input = USER_INPUT;

then, I create an object which will use this input as an variable name inside the object:

var obj = { input: Car.newCar(...)}

Then, I try to access the obj[input], but it returns to me undefined. Is it so that in javascript, I can not use variable as an object's variable name?

If I would like to define a object which has vary variable name and variable value, how can I do?

This is a possible duplicate of stackoverflow.com/questions/4119324/… — rubiii
– rubiii, Commented Apr 15, 2011 at 7:39

rubiii · Accepted Answer · 2011-04-15 07:26:13Z

2

So I guess you want the store the input under a key named after the input itself.
You can assign the value returned by Car.newCar() by using the [] method:

var input = "some text";
var obj = {};

obj[input] = Car.newCar();

answered Apr 15, 2011 at 7:26

rubiii

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Comments

Koustubh Kittur · Accepted Answer · 2018-03-06 11:32:00Z

1

Sorry changed my answer after re-reading the question

var USER_INPUT = 'something';
var obj = {};
obj[USER_INPUT] = 'value';

obj.something ; //# => value
obj['something'] ; //# => value

obj[USER_INPUT]; //# => value

edited Mar 6, 2018 at 11:32

Koustubh Kittur

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answered Apr 15, 2011 at 7:25

James Kyburz

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3 Comments

JohnP Over a year ago

no, he wants to access it like you do with PHP indices. input being a variable and not fixed string

James Kyburz Over a year ago

I know I was in the midst of changing my answer which I now have done. Note to self: More haste less spead :)

JohnP Over a year ago

here, have this +1 for your troubles :)

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