How might I extract the property values of a JavaScript object into an array?

Question

Given a JavaScript object:

var dataObject = {
   object1: {id: 1, name: "Fred"}, 
   object2: {id: 2, name: "Wilma"}, 
   object3: {id: 3, name: "Pebbles"}
};

How do I efficiently extract the inner objects into an array? I do not need to maintain a handle on the object[n] IDs.

var dataArray = [
    {id: 1, name: "Fred"}, 
    {id: 2, name: "Wilma"}, 
    {id: 3, name: "Pebbles"}]

Answer 1

var dataArray = Object.keys(dataObject).map(function(k){return dataObject[k]});

Answer 2

var dataArray = [];
for(var o in dataObject) {
    dataArray.push(dataObject[o]);
}

Answer 3

ES6版本：

var dataArray = Object.keys(dataObject).map(val => dataObject[val]);

Answer 4

使用下划线：

var dataArray = _.values(dataObject);

Answer 5

With jQuery, you can do it like this -

var dataArray = $.map(dataObject,function(v){
     return v;
});

Demo

Answer 6

ES2017 using Object.values :

 const dataObject = { object1: { id: 1, name: "Fred" }, object2: { id: 2, name: "Wilma" }, object3: { id: 3, name: "Pebbles" } }; const valuesOnly = Object.values(dataObject); console.log(valuesOnly)

Answer 7

Assuming your dataObject is defined the way you specified, you do this:

var dataArray = [];
for (var key in dataObject)
    dataArray.push(dataObject[key]);

And end up having dataArray populated with inner objects.

Answer 8

Using the accepted answer and knowing that Object.values() is proposed in ECMAScript 2017 Draft you can extend Object with method:

if(Object.values == null) {
    Object.values = function(obj) {
        var arr, o;
        arr = new Array();
        for(o in obj) { arr.push(obj[o]); }
        return arr;
    }
}

Answer 9

[Editing and updating my answer. The other answers seem to overlap with mine pretty much, but, I thought I have another ago and provide an alternative].

I present 3 solutions to this problem, based on:

• Object.keys
• Object.values
• Object.entries

Objects.keys() solution:

let keys = Object.keys(dataObject); // ["object1", "object2", "object3" ];
let keysToResult = keys.map( e => dataObject[e] ); // [{"id":1,"name":"Fred"},{"id":2,"name":"Wilma"},{"id":3,"name":"Pebbles"}]

Object.values solution:

let values = Object.values(dataObject); // [{"id":1,"name":"Fred"},{"id":2,"name":"Wilma"},{"id":3,"name":"Pebbles"}]

Object.entries solution:

let entries = Object.entries(dataObject); // [["object1",{"id":1,"name":"Fred"}],["object2",{"id":2,"name":Wilma"}],["object3",{"id":3,"name":"Pebbles"}]]
let entriesToResult = entries.map( ([k,v]) => v ); [{"id":1,"name":"Fred"},{"id":2,"name":"Wilma"},{"id":3,"name":"Pebbles"}]

All three solutions have their own features.

Object.keys() returns an array with insufficient result. So, we use Array.prototype.map to top up each value in the array to get close to what we want. In general, we can think of Object.keys() combined with map as a mechanism to customize our result list with what we want.

Object.values() is interesting since it discards the key and just returns the results only. In fact, for this problem, this is perfect since the answer requires no further processing.

Object.entries() returns more than what we want since it returns both keys and values. We need to use map to customize our result. In fact, we need to cut out the excess information.

Object.keys(), Object.values() and Object.entries() are all very useful functions which is why I wanted to show all 3 as a solution to this problem. Depending on your specific use case, you may find one to a better fit to solving your problem.

Answer 10

Maybe a bit verbose, but robust and fast

var result = [];
var keys = Object.keys(myObject);
for (var i = 0, len = keys.length; i < len; i++) {
    result.push(myObject[keys[i]]);
}

Answer 11

Object.values() method is now supported. This will give you an array of values of an object.

Object.values(dataObject)

Refer: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_objects/Object/values

Answer 12

In case you use d3. you can do d3.values(dataObject) which will give

Answer 13

I prefer to destruct object values into array:

[...Object.values(dataObject)]

var dataObject = {
   object1: {id: 1, name: "Fred"}, 
   object2: {id: 2, name: "Wilma"}, 
   object3: {id: 3, name: "Pebbles"}
};

var dataArray = [...Object.values(dataObject)];

Answer 14

这个对我有用

var dataArray = Object.keys(dataObject).map(function(k){return dataObject[k]});