Get all keys of a JavaScript object

Question

I was wondering if there was a quick way to extract keys of associative array into an array, or comma-separated list using JavaScript (jQuery is ok).

options = {key1: "value1", key2: "value2"};

Result should be the array:

["key1", "key2"]

or just a string:

"key1, key2"

Answer 1

You can easily get an array of them via a for loop, for example:

var keys = [];
for(var key in options) {
  if(options.hasOwnProperty(key)) { //to be safe
    keys.push(key);
  }
}

Then use keys how you want, for example:

var keyString = keys.join(", ");

You can test it out here. The .hasOwnProperty() check is to be safe, in case anyone messed with the object prototype and such.