# Mapper: Array Merge / Array Push

**URL:** <https://forum.alumio.com/t/mapper-array-merge-array-push/557>\
**Category:** Mappers\
**Tags:** data-transformer\
**Created:** [April 18, 2023, 1:39pm UTC](https://forum.alumio.com/t/mapper-array-merge-array-push/557 "2023-04-18T13:39:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![abubakar](https://forum.alumio.com/letter_avatar_proxy/v4/letter/a/8491ac/32.png) [@abubakar](https://forum.alumio.com/u/abubakar)\
**Post date:** [April 18, 2023, 1:39pm UTC](https://forum.alumio.com/t/mapper-array-merge-array-push/557/1 "2023-04-18T13:39:25Z")

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Hello everyone,  
Please i would like to know how i can achieve merging two arrays together or copying the data one array into another array

**sample**

“old”:[2,4,6,3,5]

“old1”:[7,0,1]

**EXPECTED RESULT**

“old”:[2,4,6,3,5,7,0,1]

---

<div class="post-metadata">

**Author:** ![jesse](https://forum.alumio.com/letter_avatar_proxy/v4/letter/j/c77e96/32.png) [@jesse](https://forum.alumio.com/u/jesse)\
**Post date:** [April 19, 2023, 5:56am UTC](https://forum.alumio.com/t/mapper-array-merge-array-push/557/2 "2023-04-19T05:56:53Z")

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Hi @abubakar,

You can use the **Operator transformer** for this. You want to perform the **Array merge** operation. By default the array will be merged to the left (first selected).

So you would get:  
**Transformer:** Operator transformer  
**Operation:** Array merge  
**Left:** old  
**Right:** old1  
\*\*Diff: \*\* (you can leave this empty, it will then be written to the _left_ (old) value.