How to get the first Element of an array - jQuery

Question

I have a multidimensional and I want to get the first element of the 2nd dimension.

myArray[0]

is my 2nd dimension. I am not able to use

myArray[0][0]

because I don't know the key of the 2nd dimenson (key = userID). Any idea how to get the first element without knowing the key?

lorenz · Accepted Answer · 2014-06-04 09:10:45Z

7

Object properties (JavaScript does not have true multidimensional or associate arrays) have no defined order, and can only be accessed via their string key.

The order of iterating over keys with a for ( in ) is implementation specific as no order is specified in the specification. For example, Chrome orders numeric keys no matter what order they are added (as an array related optimisation for V8).

If you decide you don't want to listen to me and want to live dangerously, you could get the first property according to the JavaScript implementation with var worksExceptWhenItDoesnt = myArray[Object.keys(myArray)[0]].

edited Jun 4, 2014 at 9:10

lorenz

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answered May 31, 2012 at 13:09

alex

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Comments

alex · Accepted Answer · 2014-06-04 11:26:21Z

2

Object.keys() isn't cross-browser unfortunately. To be safe, just do this:

var firstKey="";
for(firstKey in object) break;

That's it - firstKey has the firstKey value. so:

var firstKey="";
for(firstKey in myArray[0]) break;

then access via:

myArray[0][firstKey]

edited Jun 4, 2014 at 11:26

alex

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answered Feb 13, 2013 at 15:13

Ookikoi

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