How to convert json object to array in javascript

Question

I need to create an array from JSON data in node.js. I dont want to use jquery selector for this.

data = { List : ['1' , '2' , '3'] }

I am sending this data in the ajax call (POST). At the server end receving is:-

reqArray = req.param('List');
reqArray contains:- ['1' ,'2' ,'3']

I need this reqArray as an input to $in in mongoDb ,where it takes array as as input.

In the format [1 ,2 , 3] please suggest a way of doing this.

stackoverflow.com/questions/10518313/…

niknik123
– niknik123

2013-09-30 12:23:26 +00:00
Commented Sep 30, 2013 at 12:23 — niknik123
– niknik123, Commented Sep 30, 2013 at 12:23

Amberlamps · Accepted Answer · 2013-09-26 08:09:54Z

0

Try using the map function:

var numberArray = reqArray.map(function(element) {
    return +element;
});

The + will automatically convert it to a number.

Like correctly commented it is even better to use:

var numberArray = reqArray.map(Number);

edited Sep 26, 2013 at 8:09

answered Sep 26, 2013 at 8:03

Amberlamps

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5 Comments

elclanrs Over a year ago

Simpler: ['1','2','3'].map(Number); //=> [1,2,3]

Raja Over a year ago

if its not a number , lets suppose some alphaNum , then how to do this ?

Amberlamps Over a year ago

The real question is, how do you want to handle NaN values?

Raja Over a year ago

actually its going to be an _id for mongodb collection... using an array of this _ids as in input to $in in finding all the list from the collection in one go.

Amberlamps Over a year ago

Is an _id always an integer? If not, the whole question makes no sense. If it is, you need some error handling, when an element of the array is not a number.

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