Checking if a key exists in a JS object

Question

I have the following JavaScript object:

var obj = {     "key1" : val,     "key2" : val,     "key3" : val } 

Is there a way to check if a key exists in the array, similar to this?

testArray = jQuery.inArray("key1", obj); 

does not work.

Do I have to iterate through the obj like this?

jQuery.each(obj, function(key,val)){} 

Answer 1

Use the in operator:

testArray = 'key1' in obj; 

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Sidenote: What you got there, is actually no jQuery object, but just a plain JavaScript Object.

Answer 2

That's not a jQuery object, it's just an object.

You can use the hasOwnProperty method to check for a key:

if (obj.hasOwnProperty("key1")) {   ... }