Multidimensional array - how to get a value [duplicate]

Question

I have the following very massive array:

var arrayBig = {"count":31,"items":{"76":{"title":"office1","address":"<p><strong>London<\/strong><\/p>\r\n<p>Baker Str.<\/p>\r\n<p>Web site: <a href=\"http:\/\/example.org\">http:\/\/example.org<\/a><\/p>"},"57":{"title":....... etc. }....

And all I need is to get the first number in 'items', e.g. 76, with jQuery.

It's not an array. To access object attributes use . or [] operators. — zerkms
– zerkms, Commented Dec 23, 2014 at 8:52
@Alexander Arutinyants: it worth mentioning that properties of objects are not ordered. And the standard DOES NOT guarantee any order. So technically - it's impossible to retrieve the first attribute of an object. — zerkms
– zerkms, Commented Dec 23, 2014 at 8:53
Thanks. I know how to get 'title' or 'address'. But don't know how to get the number in the beginning - it has no name. — gogol75
– gogol75, Commented Dec 23, 2014 at 8:54
Ok. I see, first you wanna do search by any field, then get the number? — Alexander Art
– Alexander Art, Commented Dec 23, 2014 at 8:55

Rahul · Accepted Answer · 2014-12-23 09:06:39Z

1

try

var arrayObj = [];
    $.each(arrayBig.items, function(key, val) {

           arrayObj.push(key);

        });

alert(arrayObj[0]);

edited Dec 23, 2014 at 9:06

answered Dec 23, 2014 at 8:54

Rahul

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3 Comments

Barmar Over a year ago

How does this code take only the first value?

Rahul Over a year ago

store all values in array and take array[0]....simple.

Barmar Over a year ago

You're not doing either of those in your answer.

hsz · Accepted Answer · 2014-12-23 08:53:43Z

1

Just try with:

var firstKey = Object.keys(arrayBig.items)[0];
arrayBig.items[firstKey]

answered Dec 23, 2014 at 8:53

hsz

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3 Comments

zerkms Over a year ago

Order of properties IS NOT DEFINED and IS NOT GUARANTEED.

hsz Over a year ago

@zerkms it returns first key anyway. If it should be the lowest key in group, array of keys should be sorted.

zerkms Over a year ago

"it returns first key anyway" --- it returns for this particular run for this particular version of ECMAScript implementation. Nothing prevents the JS VM to change the object layout for memory optimization purposes. It's like crazy to rely on something that is not standardized and is not guaranteed.

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