how to flatten multidimensional array containing objects in javascript

Question

I have an multidimensional array with objects in it..How can I flatten it

myarr[0] =[{"name":"john","age":"50","location":"san diego"}
 ,{"name":"jane","age":"25","location":"new york"}
 ,{"name":"susane","age":"10","location":"los angeles"} 
 ];
myarr[1] =[{"smoker":"yes","drinker":"no","insured":"no"}
 ,{"smoker":"no","drinker":"no","insured":"yes"}
 ,{"smoker":"no","drinker":"yes","insured":"no"} 
 ];
myarr[1] =[{"status":"married","children":"none"}
 ,{"status":"unmarried","children":"one"}
 ,{"status":"unmarried","children":"two"} 
 ];

• learner: flatten means to flatten a multidimensional array --make one dimensional array of it--I mean, sorry for confusion. eg would my array containing all the objects in ascending order.
• Matt Fenwick: Check out concat here.

Answer 1

I think this is what you're trying to do.

First you want a simple helper function to merge two objects:

function merge(a, b) {
 a = a || { };
 for(var k in b)
 if(b.hasOwnProperty(k))
 a[k] = b[k];
 return a;
}

Then you can just loop through your array of arrays to merge the objects:

var flat = [ ];
for(var i = 0; i < myarr.length; ++i)
 for(var j = 0; j < myarr[i].length; ++j)
 flat[j] = merge(flat[j], myarr[i][j]);

And then sort it:

flat.sort(function(a, b) {
 a = a.location;
 b = b.location;
 if(a < b)
 return -1;
 if(a > b)
 return 1;
 return 0;
});

Demo (run with your JavaScript console open): http://jsfiddle.net/ambiguous/twpUF/

References:

• hasOwnProperty
• sort