Remove all elements from object except specified key?

javascript javascript-objects
panthro picture panthro · Apr 12, 2016 · Viewed 24.7k times · Source

I have an object:

"languages": {
    "en":["au", "uk"],
    "de":["de"],
    ....
 }

How can I remove everything but a specified key, so if I specify 'en' I just want an object that contains "en":["au", "uk"]

Answer

isvforall picture isvforall · Apr 12, 2016

Simply, you could create a new object with specified field;

var key = 'en';

var o = {
    "languages": {
        "en": ["au", "uk"],
        "de": ["de"]
    }
}

var res = {}

res[key] = o.languages[key];

Related questions

How do I check if an array includes a value in JavaScript?

What is the most concise and efficient way to find out if a JavaScript array contains a value? This is the only way I know to do it: function contains(a, obj) { for (var i = 0; i < a.length; i++) { …

Read More
How do I test for an empty JavaScript object?

After an AJAX request, sometimes my application may return an empty object, like: var a = {}; How can I check whether that's the case?

Read More
How do I remove a property from a JavaScript object?

Say I create an object as follows: let myObject = { "ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*" }; What is the best way to remove the property regex to end up with new myObject as follows? let myObject = { "ircEvent": "PRIVMSG", "method": "newURI" };

Read More