Javascript multi-dimensionally array through eval()

Question

I want to access the variable FR[0]. The variable country is "FR". I thought this would do it:

console.log("eval country: " + eval("country"));
console.log("fr0: " + FR[0]);
 console.log("eval country0: " + eval("country")[0];

The output is:

  eval country: FR
     fr0: http://www.example.co.uk/
    eval country0: F

What am I doing wrong?

Edit: the clarify: the country variable changes. Sometimes it is FR sometimes it is UK etc etc. I want to it access the appropriate variable based on the string that country contains.

#1 Don't use eval() needlessly (this is one of those times). #2, what do FR and country look like? — msanford
– msanford, Commented Nov 2, 2017 at 17:47
eval(country) would do that, however you could simply do country = FR so theres no need to use evil eval at all — Jonas Wilms
– Jonas Wilms, Commented Nov 2, 2017 at 17:50
It is really unclear what you are trying to do. What's the expected output here? Seems like it's doing what it should. — Amos47
– Amos47, Commented Nov 2, 2017 at 17:52

mweiss · Accepted Answer · 2017-11-02 18:33:54Z

1

I think to answer your specific question, you'd have to do something like:

eval(country + '[0]')

But this is terrible practice because if the string was some malicious JS, then it would be evaluated and bad things would/could happen. It would be better to just have an object store that data instead of having them in separate variables:

var myData = {
  "FR": ['http://example.co.fr', 'adf', 'asdf'],
  "UK": ['http://example.co.uk', 'asdf', 'asdf']
};

and access it like this:

myData[country][0]

answered Nov 2, 2017 at 18:33

mweiss

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