Find an array based on value of a variable

Question

I have the array

var login = ["login", "php"];

And the variable withoutNumberSign which is set based on the URL and should in this case be defined as login. I need to use the array based on the value of withoutNumberSign. How would I do that?

What is your question? What are you trying to accomplish specifically? — Gnarlywhale
– Gnarlywhale, Commented Jan 6, 2016 at 23:18
@Gnarlywhale I need to use the array based on the value of withoutNumberSign. How would I do that? — user3720306
– user3720306, Commented Jan 6, 2016 at 23:23
Are you referring to selecting an array based on the string variable in withoutNumberSign? — Gnarlywhale
– Gnarlywhale, Commented Jan 6, 2016 at 23:26

sal · Accepted Answer · 2016-01-06 23:33:07Z

2

The one solution I can see is to eval the value of withoutNumberSign and assign that to a new variable, which then you can use to dereference the array you want to use. So that would look like:

var login = ["login", "php"];
// This for testing
// var withoutNumberSign = "login";
var newvar = eval(withoutNumberSign);
console.log(newvar[0]);

A more elegant solution IMO would be to use an associative array at your first layer, on which you'd perform a lookup based on withoutNumberSign.

var associativeArray = {};
associativeArray["login"] = ["login", "php"];
console.log(associativeArray[withoutNumberSign][0]);

answered Jan 6, 2016 at 23:33

sal

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2 Comments

Gnarlywhale Over a year ago

The associativeArray solution is a much cleaner implementation.

user3720306 Over a year ago

I used the associative array and it works perfectly! Thanks!

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