How to combine these two JavaScript arrays

Question

I have two JavaScript arrays below that both have the same number of entries, but that number can vary.

[{"branchids":"5006"},{"branchids":"5007"},{"branchids":"5009"}]      
[{"branchnames":"GrooveToyota"},{"branchnames":"GrooveSubaru"},{"branchnames":"GrooveFord"}]

I want to combine these two arrays so that I get

[{"5006":"GrooveToyota"},{"5007":"GrooveSubaru"},{"5008":"GrooveFord"}]

I'm not sure how to put it into words but hopefully someone understands. I would like to do this with two arrays of arbitrary length (both the same length though).

Any tips appreciated.

Uh, in your example they're all 5006, which makes it even easier :( — Dave Newton
– Dave Newton, Commented Oct 12, 2011 at 15:18

Joe · Accepted Answer · 2011-10-12 15:28:59Z

6

It's kind of a zip:

function zip(a, b) {
    var len = Math.min(a.length, b.length),
        zipped = [],
        i, obj;
    for (i = 0; i < len; i++) {
        obj= {};
        obj[a[i].branchids] = b[i].branchnames;
        zipped.push(obj);
    }
    return zipped;
}

Example (uses console.log ie users)

edited Oct 12, 2011 at 15:28

answered Oct 12, 2011 at 15:19

Joe

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3 Comments

Hard worker Over a year ago

Do you mean 'i' instead of [0] in the fourth line from bottom?

robert Over a year ago

Using [0] there won't work, as it will get GrooveToyota and 5006 each time. Also there is a syntax error. Here is a working version of your zip approach: jsfiddle.net/K5Mur

Joe Over a year ago

@robert, you are correct sir. But it was a typo I've since fixed.

robert · Accepted Answer · 2011-10-12 15:21:20Z

3

var ids = [{"branchids":"5006"},{"branchids":"5007"},{"branchids":"5009"}];
var names = [{"branchnames":"GrooveToyota"},{"branchnames":"GrooveSubaru"},{"branchnames":"GrooveFord"}];
var combined = [];

for (var i = 0; i < ids.length; i++) {
    var combinedObject = {};
    combinedObject[ids[i].branchids] = names[i].branchnames;
    combined.push(combinedObject);
}

combined; // [{"5006":"GrooveToyota"},{"5006":"GrooveSubaru"},{"5006":"GrooveFord"}]

answered Oct 12, 2011 at 15:21

robert

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Comments

J. Holmes · Accepted Answer · 2011-10-12 15:35:38Z

0

Personally, I would do it IAbstractDownvoteFactor's way (+1), but for another option, I present the following for your coding pleasure:

var a = [{"branchids":"5006"},{"branchids":"5007"},{"branchids":"5009"}];
var b = [{"branchnames":"GrooveToyota"},{"branchnames":"GrooveSubaru"},{"branchnames":"GrooveFord"}];
var zipped = a.map(function(o,i){ var n={};n[o.branchids]=b[i].branchnames;return n;});

answered Oct 12, 2011 at 15:35

J. Holmes

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PDA · Accepted Answer · 2013-04-20 04:19:12Z

0

similar to @robert solution but using Array.prototype.map

merged; //[{5006: "GrooveToyota"}, {5006: "GrooveSubaru"}, {5006:"GrooveFord"}]

Cheers!

answered Apr 20, 2013 at 4:19

PDA

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