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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.

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1 Answer

up vote 0 down vote

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);
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5  
Simpler: ['1','2','3'].map(Number); //=> [1,2,3] –  elclanrs Sep 26 '13 at 8:08
 
@elclanrs: Thanks! –  Amberlamps Sep 26 '13 at 8:10
 
if its not a number , lets suppose some alphaNum , then how to do this ? –  Raja Sep 26 '13 at 8:12
1  
The real question is, how do you want to handle NaN values? –  Amberlamps Sep 26 '13 at 8:14
 
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. –  Raja Sep 26 '13 at 8:22
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