convert json array to javascript array

Question

i have a json array that i want to convert into a plain javascript array:

This is my json array:

var users = {"0":"John","1":"Simon","2":"Randy"}

How to convert it into a plain javascript array like this:

var users = ["John", "Simon", "Randy"]

Solution 1

users is already a JS object (not JSON). But here you go:

var users_array = [];
for(var i in users) {
    if(users.hasOwnProperty(i) && !isNaN(+i)) {
        users_array[+i] = users[i];
    }
}

Edit: Insert elements at correct position in array. Thanks @RoToRa.

Maybe it is easier to not create this kind of object in the first place. How is it created?

Solution 2

Just for fun - if you know the length of the array, then the following will work (and seems to be faster):

users.length = 3;
users = Array.prototype.slice.call(users);

Comments

[shasi kanth]

This json array is created dynamically with Zend_Json::encode, but the response is passed back to a js function, that accepts a plain javascript array.

[Felix Kling]

@dskanth: If you are not doing anything fancy, use the native function json_encode. It will only turn associative arrays into JSON objects and numerical indexed ones into arrays.

[RoToRa]

Careful, your code may not assign the values to the correct indexes, because you are assuming the object properties are iterated sorted. if (!isNaN(+i)) {users_array[+i] = users[i]} may be better.

[Felix Kling]

@RoToRa: You are right. No I did not assume that they are sorted, but I didn't pay attention to the order... I will add this to my answer.