# Problem with an array in an array (2d array) **URL:** \ **Category:** Help\ **Created:** [January 3, 2021, 6:38pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327 "2021-01-03T18:38:52Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![GameGod](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/gamegod/32/2756_2.png) [@GameGod](https://forum.makecode.com/u/GameGod)\ **Post date:** [January 3, 2021, 6:38pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/1 "2021-01-03T18:38:52Z")
> **[otherworldly](https://arcade.makecode.com/90359-50739-35698-96852)** > > Made with ❤️ in Microsoft MakeCode Arcade. There is an error in the code - how can I solve it? It is saying something about one of my blocks. This block is an array in an array. It is meant to make a two-dimensional array. How can I fix the error? Is there an easier way to make a two-dimensional array? Drawing to explain what I want: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/5/5f7aa8c396d5955933632e0c0491602425d0ca55.png) ---
**Author:** ![darzu](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/darzu/32/1882_2.png) [@darzu](https://forum.makecode.com/u/darzu)\ **Post date:** [January 3, 2021, 6:52pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/2 "2021-01-03T18:52:01Z")
“StartingHeights[]” variable is being used as both a number[][] and number[] so the MakeCode compiler is getting confused. This line: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/2/2c478990ee875347e9ad846b716fa854b3e88d79.png) inserts “StartingHightForMakingWorld” which MakeCode thinks is a number thus it thinks StartingHeights[] is a number[] here. This line: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/f/ff332696aaa8e332c1b63a92117d15e73e62d111.png) and this line: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/8/84b99e97714e7eb4f948ddc49ff4deb94a0aa7df.png) is why MakeCode thinks StartingHightForMakingWorld is a number because “change \_ by \_” only works on numbers. ---
**Author:** ![GameGod](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/gamegod/32/2756_2.png) [@GameGod](https://forum.makecode.com/u/GameGod)\ **Post date:** [January 3, 2021, 7:05pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/3 "2021-01-03T19:05:39Z")
I think I’ve changed some things, but why is it still showing the error? > **[otherworldly](https://arcade.makecode.com/12354-16214-90106-65809)** > > Made with ❤️ in Microsoft MakeCode Arcade. ---
**Author:** ![darzu](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/darzu/32/1882_2.png) [@darzu](https://forum.makecode.com/u/darzu)\ **Post date:** [January 3, 2021, 7:09pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/4 "2021-01-03T19:09:36Z")
You’re still treating CurrentHightForMakingWorld as a number: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/1/13397a54a9e7d89faddfa0ec8c4b9636ed26bed8.png) and then you’re assigning CurrentHightForMakingWorld to EndHightForMakingWorld: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/d/d0fac07878c664b8ab8f79c4fb0e479721a5eed6.png) but also you’re expecting EndHightForMakingWorld to be a number[]: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/9/990274feba7d9152c6482ff95e0bf2d60e1fc227.png) ---
**Author:** ![GameGod](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/gamegod/32/2756_2.png) [@GameGod](https://forum.makecode.com/u/GameGod)\ **Post date:** [January 3, 2021, 7:20pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/5 "2021-01-03T19:20:38Z")
Um, I’m sorry. I still am having trouble. CurrentHightForMakingWorld is supposed to be a number. So is EndHightForMakingWorld. > [@darzu](#): > > but also you’re expecting EndHightForMakingWorld to be a number: > > ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/9/990274feba7d9152c6482ff95e0bf2d60e1fc227.png) I changed this. it stll has errors. > **[otherworldly](https://arcade.makecode.com/95418-75291-51504-98102)** > > Made with ❤️ in Microsoft MakeCode Arcade. ---
**Author:** ![darzu](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/darzu/32/1882_2.png) [@darzu](https://forum.makecode.com/u/darzu)\ **Post date:** [January 3, 2021, 7:24pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/6 "2021-01-03T19:24:26Z")
Good to know “StartingHightForMakingWorld” should be “number”. Therefore this is a problem: ![image](https://us1.discourse-cdn.com/flex020/uploads/makecode/original/2X/7/723531038794d3bb8008d48dea865ab64f4aef30.png) because EndingHeights is number[][] (two dimensional like you said), when you do “get value at” from a number[][] you get a number[] in return which it is then trying to assign to StartingHightForMakingWorld. (\_ get value at \_) “peels” one layer of an array’s type. So number[][] becomes number[], number[] becomes number, etc. If you want to get a single number, you have to do ((EndingHeights[] get value at (CurrentMapX)) get value at ???) ---
**Author:** ![DahbixLP](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/dahbixlp/32/4760_2.png) [@DahbixLP](https://forum.makecode.com/u/DahbixLP)\ **Post date:** [January 3, 2021, 7:34pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/7 "2021-01-03T19:34:27Z")
Here is the current version of the Sprite Art! > **[Otherworldly Sprite Art](https://arcade.makecode.com/16610-25760-60354-24532)** > > Made with ❤️ in Microsoft MakeCode Arcade. ---
**Author:** ![GameGod](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/gamegod/32/2756_2.png) [@GameGod](https://forum.makecode.com/u/GameGod)\ **Post date:** [January 3, 2021, 9:59pm UTC](https://forum.makecode.com/t/problem-with-an-array-in-an-array-2d-array/5327/8 "2021-01-03T21:59:23Z")
Thanks! All my arrays were number[]. Then, I had to change them to number[][]. I didn’t know I missed that one!