# List Join

**URL:** <https://forum.dynamobim.com/t/list-join/29532>\
**Category:** Revit\
**Tags:** dynamo\
**Created:** [December 10, 2018, 4:50pm UTC](https://forum.dynamobim.com/t/list-join/29532 "2018-12-10T16:50:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jobiols](https://avatars.discourse-cdn.com/v4/letter/j/8e8cbc/32.png) [@jobiols](https://forum.dynamobim.com/u/jobiols)\
**Post date:** [December 10, 2018, 4:50pm UTC](https://forum.dynamobim.com/t/list-join/29532/1 "2018-12-10T16:50:15Z")

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Hi,

I would like to join this two lists, but instead of getting them one after the other, to be combined like in the picture.  
Is the solution related to Lacing? In this case, how can I apply it to the node List.Join?

Thanks!

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/8/585e40135a46322d09d85d56a57eaeb91df198b9.png)

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**Author:** ![lucamanzoni](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/lucamanzoni/32/56718_2.png) [@lucamanzoni](https://forum.dynamobim.com/u/lucamanzoni)\
**Post date:** [December 10, 2018, 5:06pm UTC](https://forum.dynamobim.com/t/list-join/29532/2 "2018-12-10T17:06:40Z")

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Not sure to understand, do you mean something like this?

 ![ListInsert](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/a/8a043599d11e5b050e9eed81b8d4e652a4b3b637.png)

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**Author:** ![SeanP](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/seanp/32/42560_2.png) [@SeanP](https://forum.dynamobim.com/u/SeanP)\
**Post date:** [December 10, 2018, 11:27pm UTC](https://forum.dynamobim.com/t/list-join/29532/3 "2018-12-10T23:27:20Z")

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You could also use List.Combine and the List.Join as the method.

> [@List.Combine + List.Join behave oddly - bug?](https://forum.dynamobim.com/t/list-combine-list-join-behave-oddly-bug/2727/2):
>
> When List.Combine has 2 list input nodes (list1,list2) the combinator (in your case List.Join) should also have a corresponding number (2) of empty input nodes. I suspect your definition will work consistently (without you having to toggle +/-) if the List.Join node is as below. [20151216-5]

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<div class="post-metadata">

**Author:** ![jobiols](https://avatars.discourse-cdn.com/v4/letter/j/8e8cbc/32.png) [@jobiols](https://forum.dynamobim.com/u/jobiols)\
**Post date:** [December 11, 2018, 7:48am UTC](https://forum.dynamobim.com/t/list-join/29532/4 "2018-12-11T07:48:30Z")

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Thanks! I didn’t know this node.