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"}     
               ];

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. — learner
– learner, Commented Oct 28, 2011 at 4:08

mu is too short · Accepted Answer · 2011-10-31 05:53:57Z

2

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:

edited Oct 31, 2011 at 5:53

answered Oct 28, 2011 at 5:39

mu is too short

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