Return unique keys from JavaScript Array

Question

I'm hoping my question is using the correct terminology...

Can someone explain to me how I can perform the following:

If I have an array consisting of:

Object { id=1498, brandName="Booths", quality="Standard"} Object { id=1499, brandName="Booths", quality="Standard"}

How can I iterate throughout that array and return another array of distinct 'keys'?

Ultimately I want an array which would return something like:

[id,brandName,quality] (but the original array is going to return different keys at different times.

Have I made sense?

You may simply use for (var key in obj) { ... }. Or is there a problem? If so, show us your code. — VisioN
– VisioN, Commented Sep 21, 2012 at 10:45
No, have tried that, it just returns the first key, I need it pumped to an array with unique keys. — JasonMHirst
– JasonMHirst, Commented Sep 21, 2012 at 10:47

KooiInc · Accepted Answer · 2012-09-21 10:57:32Z

3

You can use Object.keys:

var a1 = [{ id:1498, brandName:"Booths", quality:"Standard"}, 
          { id:1499, brandName:"Booths", quality:"Standard"}],
    a1Keys = a1.map(function(a){return Object.keys(a);});
//a1Keys now:
[['id','brandName','quality'],['id','brandName','quality']]

The keys method is described @MDN, including a shim for older browsers

edited Sep 21, 2012 at 10:57

answered Sep 21, 2012 at 10:50

KooiInc

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1 Comment

JasonMHirst Over a year ago

That's almost exactly what I want, returns the names exactly as wanted, just need to now return only one array of unique keys rather than 1500 of them. Thank you.

Less · Accepted Answer · 2012-09-21 10:51:47Z

0

var a = {"a": 1, "b": "t" };
var keys = new Array();
for(var o in a){
    keys.push(o);
}
console.log(keys)

answered Sep 21, 2012 at 10:51

Less

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