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.

array[1]:[Array-Data]
array[2]:[Array-Data]

So I tried to convert this object to an array by iterating with $.each through the object and adding the element to an array:

x=[]
$.each(myObj, function(i,n) {
    x.push(n);});

Is there an better way to convert an object to an array or maybe a function?

Answer 1

How about jQuery.makeArray(obj)

This is how I did it in my app.

Answer 2

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 3

If you know the maximum index in you object you can do the following:

var myObj = {
    1: ['c', 'd'],
    2: ['a', 'b']
  },
  myArr;

myObj.length = 3; //max index + 1
myArr = Array.prototype.slice.apply(myObj);
console.log(myArr); //[undefined, ['c', 'd'], ['a', 'b']]

Answer 4

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 5

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

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

Answer 6

After some tests, here is a general object to array function convertor:

You have the object:

var obj = {
    some_key_1: "some_value_1"
    some_key_2: "some_value_2"
};

The function:

function ObjectToArray(o)
{
    var k = Object.getOwnPropertyNames(o);
    var v = Object.values(o);

    var c = function(l)
    {
        this.k = [];
        this.v = [];
        this.length = l;
    };

    var r = new c(k.length);

    for (var i = 0; i < k.length; i++)
    {
        r.k[i] = k[i];
        r.v[i] = v[i];
    }

    return r;
}

Function Use:

var arr = ObjectToArray(obj);

You Get:

arr {
    key: [
        "some_key_1",
        "some_key_2"
    ],
    value: [
        "some_value_1",
        "some_value_2"
    ],
    length: 2
}

So then you can reach all keys & values like:

for (var i = 0; i < arr.length; i++)
{
    console.log(arr.key[i] + " = " + arr.value[i]);
}

Result in console:

some_key_1 = some_value_1
some_key_2 = some_value_2

Edit:

Or in prototype form:

Object.prototype.objectToArray = function()
{
    if (
        typeof this != 'object' ||
        typeof this.length != "undefined"
    ) {
        return false;
    }

    var k = Object.getOwnPropertyNames(this);
    var v = Object.values(this);

    var c = function(l)
    {
        this.k = [];
        this.v = [];
        this.length = l;
    };

    var r = new c(k.length);

    for (var i = 0; i < k.length; i++)
    {
        r.k[i] = k[i];
        r.v[i] = v[i];
    }

    return r;
};

And then use like:

console.log(obj.objectToArray);