javascript - how to get object name or associative array index name?

Question

I have a JSON object like such:

Click to copy

var list = {'name1' : {'element1': 'value1'}, 'name2' : {'element1': 'value2'});

How do I extract all the nameX string values?

For example, suppose I want to output them concatenated in a string such as: "name1 name2"

Use of jQuery in any solution is fine. Please advise...

Answer 1

To get the keys of an object, there is Object.keys in ES5, which returns an array:

Click to copy

Object.keys(list).join(" "); // "name1 name2"

If you want to filter the keys, you can use .filter:

Click to copy

Object.keys(list).filter(function(key) {
  return key.indexOf("name") === 0; // filter keys that start with "name"
}).join(" "); // "name1 name2"

Answer 2

Click to copy

var names = Object.keys(list);