Converting a JS object to an array using jQuery

Question

My application creates a JavaScript object, like the following:

myObj= {1:[Array-Data], 2:[Array-Data]}

But I need this object as an array.

Answer 1

How about jQuery.makeArray(obj)

This is how I did it in my app.

Answer 2

Nowadays, there is a simple way to do this : Object.values().

var myObj = {
    1: [1, 2, 3],
    2: [4, 5, 6]
};

console.log(Object.values(myObj));

Output:

[[1, 2, 3], [4, 5, 6]]

This doesn't required jQuery, it's been defined in ECMAScript 2017.
It's supported by every modern browser (forget IE).

Answer 3

The best method would be using a javascript -only function:

var myArr = Array.prototype.slice.call(myObj, 0);

Answer 4

If you are looking for a functional approach:

var obj = {1: 11, 2: 22};
var arr = Object.keys(obj).map(function (key) { return obj[key]; });

Results in:

[11, 22]

The same with an ES6 arrow function:

Object.keys(obj).map(key => obj[key])

With ES7 you will be able to use Object.values instead (more information):

var arr = Object.values(obj);

Or if you are already using Underscore/Lo-Dash:

var arr = _.values(obj)

Answer 5

I think you can use for in but checking if the property is not inerithed

myObj= {1:[Array-Data], 2:[Array-Data]}
var arr =[];
for( var i in myObj ) {
    if (myObj.hasOwnProperty(i)){
       arr.push(myObj[i]);
    }
}

EDIT - if you want you could also keep the indexes of your object, but you have to check if they are numeric (and you get undefined values for missing indexes:

function isNumber(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

myObj= {1:[1,2], 2:[3,4]}
var arr =[];
for( var i in myObj ) {
    if (myObj.hasOwnProperty(i)){
        if (isNumber(i)){
            arr[i] = myObj[i];
        }else{
          arr.push(myObj[i]);
        }
    }
}

Answer 6

Since ES5 Object.keys() returns an array containing the properties defined directly on an object (excluding properties defined in the prototype chain):

Object.keys(yourObject).map(function(key){ return yourObject[key] });

ES6 takes it one step further with arrow functions:

Object.keys(yourObject).map(key => yourObject[key]);